81565600892 has 12 divisors (see below), whose sum is σ = 143537231880. Its totient is φ = 40554963216.

The previous prime is 81565600847. The next prime is 81565601081. The reversal of 81565600892 is 29800656518.

It is a self number, because there is not a number n which added to its sum of digits gives 81565600892.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56958503 + ... + 56959934.

It is an arithmetic number, because the mean of its divisors is an integer number (11961435990).

Almost surely, 2^81565600892 is an apocalyptic number.

It is an amenable number.

81565600892 is a deficient number, since it is larger than the sum of its proper divisors (61971630988).

81565600892 is a wasteful number, since it uses less digits than its factorization.

81565600892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113918620 (or 113918618 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 81565600892 in words is "eighty-one billion, five hundred sixty-five million, six hundred thousand, eight hundred ninety-two".