81080611524 has 432 divisors, whose sum is σ = 245437710336. Its totient is φ = 23204361600.

The previous prime is 81080611501. The next prime is 81080611561. The reversal of 81080611524 is 42511608018.

81080611524 is a `hidden beast` number, since 8 + 10 + 8 + 0 + 611 + 5 + 24 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 638429949 + ... + 638430075.

It is an arithmetic number, because the mean of its divisors is an integer number (568142848).

Almost surely, 2^81080611524 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81080611524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122718855168).

81080611524 is an abundant number, since it is smaller than the sum of its proper divisors (164357098812).

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

81080611524 is a wasteful number, since it uses less digits than its factorization.

81080611524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The spelling of 81080611524 in words is "eighty-one billion, eighty million, six hundred eleven thousand, five hundred twenty-four".