81950492574 has 48 divisors (see below), whose sum is σ = 179548259904. Its totient is φ = 27011980800.

The previous prime is 81950492567. The next prime is 81950492593. The reversal of 81950492574 is 47529405918.

It is a happy number.

81950492574 is a `hidden beast` number, since 8 + 19 + 50 + 4 + 9 + 2 + 574 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 81950492574.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 829914 + ... + 923394.

It is an arithmetic number, because the mean of its divisors is an integer number (3740588748).

Almost surely, 2^81950492574 is an apocalyptic number.

81950492574 is an abundant number, since it is smaller than the sum of its proper divisors (97597767330).

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

81950492574 is a wasteful number, since it uses less digits than its factorization.

81950492574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94033 (or 94030 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 81950492574 in words is "eighty-one billion, nine hundred fifty million, four hundred ninety-two thousand, five hundred seventy-four".