81950492576 has 12 divisors (see below), whose sum is σ = 161340032322. Its totient is φ = 40975246272.

The previous prime is 81950492567. The next prime is 81950492593. The reversal of 81950492576 is 67529405918.

It can be written as a sum of positive squares in only one way, i.e., 80077680400 + 1872812176 = 282980^2 + 43276^2 .

It is a super-2 number, since 2×81950492576² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280476415 + ... + 1280476478.

Almost surely, 2^81950492576 is an apocalyptic number.

It is an amenable number.

81950492576 is a deficient number, since it is larger than the sum of its proper divisors (79389539746).

81950492576 is a wasteful number, since it uses less digits than its factorization.

81950492576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560952903 (or 2560952895 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 56.

The spelling of 81950492576 in words is "eighty-one billion, nine hundred fifty million, four hundred ninety-two thousand, five hundred seventy-six".