81156258677760 has 1408 divisors, whose sum is σ = 324338144772096. Its totient is φ = 16896900464640.

The previous prime is 81156258677677. The next prime is 81156258677771. The reversal of 81156258677760 is 6777685265118.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9517558617 + ... + 9517567143.

Almost surely, 2^{81156258677760} is an apocalyptic number.

81156258677760 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 81156258677760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162169072386048).

81156258677760 is an abundant number, since it is smaller than the sum of its proper divisors (243181886094336).

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

81156258677760 is a wasteful number, since it uses less digits than its factorization.

81156258677760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8747 (or 8729 counting only the distinct ones).

The product of its (nonzero) digits is 237081600, while the sum is 69.

The spelling of 81156258677760 in words is "eighty-one trillion, one hundred fifty-six billion, two hundred fifty-eight million, six hundred seventy-seven thousand, seven hundred sixty".