81670979496 has 64 divisors (see below), whose sum is σ = 213113157120. Its totient is φ = 26032881600.

The previous prime is 81670979491. The next prime is 81670979497. The reversal of 81670979496 is 69497907618.

It is not an unprimeable number, because it can be changed into a prime (81670979491) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2217891 + ... + 2254413.

It is an arithmetic number, because the mean of its divisors is an integer number (3329893080).

Almost surely, 2^81670979496 is an apocalyptic number.

It is an amenable number.

81670979496 is an abundant number, since it is smaller than the sum of its proper divisors (131442177624).

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

81670979496 is a wasteful number, since it uses less digits than its factorization.

81670979496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40606 (or 40602 counting only the distinct ones).

The product of its (nonzero) digits is 41150592, while the sum is 66.

The spelling of 81670979496 in words is "eighty-one billion, six hundred seventy million, nine hundred seventy-nine thousand, four hundred ninety-six".