81573157960 has 64 divisors (see below), whose sum is σ = 212633020800. Its totient is φ = 27584810496.

The previous prime is 81573157951. The next prime is 81573157987. The reversal of 81573157960 is 6975137518.

It is a super-2 number, since 2×81573157960² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81573157898 and 81573157907.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1974990 + ... + 2015869.

It is an arithmetic number, because the mean of its divisors is an integer number (3322390950).

Almost surely, 2^81573157960 is an apocalyptic number.

It is an amenable number.

81573157960 is an abundant number, since it is smaller than the sum of its proper divisors (131059862840).

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

81573157960 is a wasteful number, since it uses less digits than its factorization.

81573157960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990950 (or 3990946 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 52.

The spelling of 81573157960 in words is "eighty-one billion, five hundred seventy-three million, one hundred fifty-seven thousand, nine hundred sixty".