81920212592 has 20 divisors (see below), whose sum is σ = 158728426296. Its totient is φ = 40958038080.

The previous prime is 81920212553. The next prime is 81920212681. The reversal of 81920212592 is 29521202918.

It is a super-2 number, since 2×81920212592² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 227318 + ... + 464234.

Almost surely, 2^81920212592 is an apocalyptic number.

It is an amenable number.

81920212592 is a deficient number, since it is larger than the sum of its proper divisors (76808213704).

81920212592 is a wasteful number, since it uses less digits than its factorization.

81920212592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258536 (or 258530 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 81920212592 in words is "eighty-one billion, nine hundred twenty million, two hundred twelve thousand, five hundred ninety-two".