81504715332279 has 16 divisors (see below), whose sum is σ = 112664158881120. Its totient is φ = 52349003064960.

The previous prime is 81504715332169. The next prime is 81504715332281. The reversal of 81504715332279 is 97223351740518.

It is not a de Polignac number, because 81504715332279 - 2³⁵ = 81470355593911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81504715332289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1016050792 + ... + 1016131005.

It is an arithmetic number, because the mean of its divisors is an integer number (7041509930070).

Almost surely, 2^{81504715332279} is an apocalyptic number.

81504715332279 is a deficient number, since it is larger than the sum of its proper divisors (31159443548841).

81504715332279 is a wasteful number, since it uses less digits than its factorization.

81504715332279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032182290.

The product of its (nonzero) digits is 12700800, while the sum is 57.

The spelling of 81504715332279 in words is "eighty-one trillion, five hundred four billion, seven hundred fifteen million, three hundred thirty-two thousand, two hundred seventy-nine".