81632690610 has 64 divisors (see below), whose sum is σ = 199450145664. Its totient is φ = 21379737600.

The previous prime is 81632690597. The next prime is 81632690621. The reversal of 81632690610 is 1609623618.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274140 + ... + 488280.

It is an arithmetic number, because the mean of its divisors is an integer number (3116408526).

Almost surely, 2^81632690610 is an apocalyptic number.

81632690610 is an abundant number, since it is smaller than the sum of its proper divisors (117817455054).

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

81632690610 is a wasteful number, since it uses less digits than its factorization.

81632690610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214379.

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 81632690610 in words is "eighty-one billion, six hundred thirty-two million, six hundred ninety thousand, six hundred ten".