81277625904 has 40 divisors (see below), whose sum is σ = 215641994160. Its totient is φ = 26360310528.

The previous prime is 81277625899. The next prime is 81277625909. The reversal of 81277625904 is 40952677218.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81277625899) and next prime (81277625909).

It is not an unprimeable number, because it can be changed into a prime (81277625909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22880439 + ... + 22883990.

It is an arithmetic number, because the mean of its divisors is an integer number (5391049854).

Almost surely, 2^81277625904 is an apocalyptic number.

It is an amenable number.

81277625904 is an abundant number, since it is smaller than the sum of its proper divisors (134364368256).

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

81277625904 is a wasteful number, since it uses less digits than its factorization.

81277625904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45764477 (or 45764471 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 81277625904 in words is "eighty-one billion, two hundred seventy-seven million, six hundred twenty-five thousand, nine hundred four".