81379658975 has 12 divisors (see below), whose sum is σ = 101010819120. Its totient is φ = 65039184000.

The previous prime is 81379658957. The next prime is 81379658981. The reversal of 81379658975 is 57985697318.

It is a de Polignac number, because none of the positive numbers 2^k-81379658975 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1587851 + ... + 1638300.

It is an arithmetic number, because the mean of its divisors is an integer number (8417568260).

Almost surely, 2^81379658975 is an apocalyptic number.

81379658975 is a deficient number, since it is larger than the sum of its proper divisors (19631160145).

81379658975 is a wasteful number, since it uses less digits than its factorization.

81379658975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227170 (or 3227165 counting only the distinct ones).

The product of its digits is 114307200, while the sum is 68.

The spelling of 81379658975 in words is "eighty-one billion, three hundred seventy-nine million, six hundred fifty-eight thousand, nine hundred seventy-five".