81513796008 has 32 divisors (see below), whose sum is σ = 210811543200. Its totient is φ = 26234324928.

The previous prime is 81513795983. The next prime is 81513796031. The reversal of 81513796008 is 80069731518.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

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, 58558066 + ... + 58559457.

It is an arithmetic number, because the mean of its divisors is an integer number (6587860725).

Almost surely, 2^81513796008 is an apocalyptic number.

It is an amenable number.

81513796008 is an abundant number, since it is smaller than the sum of its proper divisors (129297747192).

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

81513796008 is a wasteful number, since it uses less digits than its factorization.

81513796008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117117561 (or 117117557 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 81513796008 in words is "eighty-one billion, five hundred thirteen million, seven hundred ninety-six thousand, eight".