81804656570 has 64 divisors (see below), whose sum is σ = 181903034880. Its totient is φ = 25793503488.

The previous prime is 81804656561. The next prime is 81804656627. The reversal of 81804656570 is 7565640818.

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, 77699 + ... + 411881.

It is an arithmetic number, because the mean of its divisors is an integer number (2842234920).

Almost surely, 2^81804656570 is an apocalyptic number.

81804656570 is an abundant number, since it is smaller than the sum of its proper divisors (100098378310).

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

81804656570 is a wasteful number, since it uses less digits than its factorization.

81804656570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334479.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 81804656570 in words is "eighty-one billion, eight hundred four million, six hundred fifty-six thousand, five hundred seventy".