81012458508 has 24 divisors (see below), whose sum is σ = 195547314480. Its totient is φ = 26072975040.

The previous prime is 81012458489. The next prime is 81012458521. The reversal of 81012458508 is 80585421018.

It is a self number, because there is not a number n which added to its sum of digits gives 81012458508.

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, 116396863 + ... + 116397558.

It is an arithmetic number, because the mean of its divisors is an integer number (8147804770).

Almost surely, 2^81012458508 is an apocalyptic number.

It is an amenable number.

81012458508 is an abundant number, since it is smaller than the sum of its proper divisors (114534855972).

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

81012458508 is a wasteful number, since it uses less digits than its factorization.

81012458508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232794457 (or 232794455 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 42.

The spelling of 81012458508 in words is "eighty-one billion, twelve million, four hundred fifty-eight thousand, five hundred eight".