81379632994 has 16 divisors (see below), whose sum is σ = 135042261696. Its totient is φ = 36469745200.

The previous prime is 81379632937. The next prime is 81379633021. The reversal of 81379632994 is 49923697318.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26048257 + ... + 26051380.

It is an arithmetic number, because the mean of its divisors is an integer number (8440141356).

Almost surely, 2^81379632994 is an apocalyptic number.

81379632994 is a deficient number, since it is larger than the sum of its proper divisors (53662628702).

81379632994 is a wasteful number, since it uses less digits than its factorization.

81379632994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52099721.

The product of its digits is 17635968, while the sum is 61.

The spelling of 81379632994 in words is "eighty-one billion, three hundred seventy-nine million, six hundred thirty-two thousand, nine hundred ninety-four".