Search a number
-
+
81618312606860 = 22518648532188331
BaseRepresentation
bin10010100011101100111110…
…100001111011010010001100
3101200222122010112112022121202
4102203230332201323102030
541144213301011404420
6445330534000045032
723122504605243641
oct2243547641732214
9350878115468552
1081618312606860
112400814a755167
1291a2213903778
13367075c9ab8b3
1416224c1403dc8
1596812da75575
hex4a3b3e87b48c

81618312606860 has 24 divisors (see below), whose sum is σ = 171398626708176. Its totient is φ = 32647292617280.

The previous prime is 81618312606799. The next prime is 81618312606877. The reversal of 81618312606860 is 6860621381618.

It is a super-3 number, since 3×816183126068603 (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 81618312606796 and 81618312606805.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36202895 + ... + 38391225.

It is an arithmetic number, because the mean of its divisors is an integer number (7141609446174).

Almost surely, 281618312606860 is an apocalyptic number.

It is an amenable number.

81618312606860 is an abundant number, since it is smaller than the sum of its proper divisors (89780314101316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81618312606860 is a wasteful number, since it uses less digits than its factorization.

81618312606860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053193 (or 4053191 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 56.

The spelling of 81618312606860 in words is "eighty-one trillion, six hundred eighteen billion, three hundred twelve million, six hundred six thousand, eight hundred sixty".

Divisors: 1 2 4 5 10 20 1864853 2188331 3729706 4376662 7459412 8753324 9324265 10941655 18648530 21883310 37297060 43766620 4080915630343 8161831260686 16323662521372 20404578151715 40809156303430 81618312606860