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81729266099697 = 3220589494410517
BaseRepresentation
bin10010100101010100010011…
…110111111010010111110001
3101201101020112002002202021100
4102211110103313322113301
541203023014110142242
6445453523450315013
723133513255335616
oct2245242367722761
9351336462082240
1081729266099697
1124050207043587
1291bb819a28a69
13367b0628b1338
141627a090aa50d
1596ae7471454c
hex4a5513dfa5f1

81729266099697 has 12 divisors (see below), whose sum is σ = 118053468469300. Its totient is φ = 54486138583008.

The previous prime is 81729266099671. The next prime is 81729266099743. The reversal of 81729266099697 is 79699066292718.

It can be written as a sum of positive squares in 2 ways, for example, as 31092322450401 + 50636943649296 = 5576049^2 + 7115964^2 .

It is not a de Polignac number, because 81729266099697 - 210 = 81729266098673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81729266099597) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16325283 + ... + 20735799.

Almost surely, 281729266099697 is an apocalyptic number.

It is an amenable number.

81729266099697 is a deficient number, since it is larger than the sum of its proper divisors (36324202369603).

81729266099697 is a wasteful number, since it uses less digits than its factorization.

81729266099697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6469472 (or 6469469 counting only the distinct ones).

The product of its (nonzero) digits is 2222131968, while the sum is 81.

The spelling of 81729266099697 in words is "eighty-one trillion, seven hundred twenty-nine billion, two hundred sixty-six million, ninety-nine thousand, six hundred ninety-seven".