81565933080996 has 1215 divisors, whose sum is σ = 278682128564931. Its totient is φ = 20100830690304.

The previous prime is 81565933080851. The next prime is 81565933081007. The reversal of 81565933080996 is 69908033956518.

The square root of 81565933080996 is 9031386.

It is a perfect power (a square), and thus also a powerful number.

81565933080996 is a `hidden beast` number, since 8 + 156 + 59 + 330 + 8 + 0 + 9 + 96 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 736483210596 + 80829449870400 = 858186^2 + 8990520^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 404 ways as a sum of consecutive naturals, for example, 586805273895 + ... + 586805274033.

Almost surely, 2^{81565933080996} is an apocalyptic number.

81565933080996 is the 9031386-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81565933080996

81565933080996 is an abundant number, since it is smaller than the sum of its proper divisors (197116195483935).

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

81565933080996 is a wasteful number, since it uses less digits than its factorization.

81565933080996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 377913600, while the sum is 72.

The spelling of 81565933080996 in words is "eighty-one trillion, five hundred sixty-five billion, nine hundred thirty-three million, eighty thousand, nine hundred ninety-six".