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81630156480 = 2635477922901
BaseRepresentation
bin100110000000110001…
…0010101011011000000
321210200221112121021220
41030001202111123000
52314134310001410
6101300025315040
75616604611255
oct1140142253300
9253627477256
1081630156480
113168a105844
12139a1935a80
13790ba98b52
143d4547d42c
1521cb678070
hex13018956c0

81630156480 has 224 divisors, whose sum is σ = 268052336640. Its totient is φ = 21034291200.

The previous prime is 81630156479. The next prime is 81630156493. The reversal of 81630156480 is 8465103618.

It is a super-3 number, since 3×816301564803 (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3553030 + ... + 3575930.

Almost surely, 281630156480 is an apocalyptic number.

81630156480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81630156480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134026168320).

81630156480 is an abundant number, since it is smaller than the sum of its proper divisors (186422180160).

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

81630156480 is a wasteful number, since it uses less digits than its factorization.

81630156480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23047 (or 23037 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 81630156480 in words is "eighty-one billion, six hundred thirty million, one hundred fifty-six thousand, four hundred eighty".