81560568290496 has 56 divisors (see below), whose sum is σ = 215806458905904. Its totient is φ = 27185496898560.

The previous prime is 81560568290491. The next prime is 81560568290519. The reversal of 81560568290496 is 69409286506518.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81560568290496.

It is not an unprimeable number, because it can be changed into a prime (81560568290491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6764695 + ... + 14452758.

Almost surely, 2^{81560568290496} is an apocalyptic number.

It is an amenable number.

81560568290496 is an abundant number, since it is smaller than the sum of its proper divisors (134245890615408).

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

81560568290496 is a wasteful number, since it uses less digits than its factorization.

81560568290496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21237489 (or 21237479 counting only the distinct ones).

The product of its (nonzero) digits is 223948800, while the sum is 69.

The spelling of 81560568290496 in words is "eighty-one trillion, five hundred sixty billion, five hundred sixty-eight million, two hundred ninety thousand, four hundred ninety-six".