81560356663 has 12 divisors (see below), whose sum is σ = 86652056592. Its totient is φ = 76752220160.

The previous prime is 81560356601. The next prime is 81560356681. The reversal of 81560356663 is 36665306518.

It is not a de Polignac number, because 81560356663 - 2³³ = 72970422071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81560359663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2834358 + ... + 2862988.

It is an arithmetic number, because the mean of its divisors is an integer number (7221004716).

Almost surely, 2^81560356663 is an apocalyptic number.

81560356663 is a deficient number, since it is larger than the sum of its proper divisors (5091699929).

81560356663 is a wasteful number, since it uses less digits than its factorization.

81560356663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38522 (or 38505 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 81560356663 in words is "eighty-one billion, five hundred sixty million, three hundred fifty-six thousand, six hundred sixty-three".