81375278676 has 48 divisors (see below), whose sum is σ = 204121666560. Its totient is φ = 25150698720.

The previous prime is 81375278627. The next prime is 81375278707. The reversal of 81375278676 is 67687257318.

It is a happy number.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

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 15 ways as a sum of consecutive naturals, for example, 3786190 + ... + 3807621.

It is an arithmetic number, because the mean of its divisors is an integer number (4252534720).

Almost surely, 2^81375278676 is an apocalyptic number.

It is an amenable number.

81375278676 is an abundant number, since it is smaller than the sum of its proper divisors (122746387884).

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

81375278676 is a wasteful number, since it uses less digits than its factorization.

81375278676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7593884 (or 7593882 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 60.

The spelling of 81375278676 in words is "eighty-one billion, three hundred seventy-five million, two hundred seventy-eight thousand, six hundred seventy-six".