81137376807 has 16 divisors (see below), whose sum is σ = 120575669760. Its totient is φ = 48230266752.

The previous prime is 81137376799. The next prime is 81137376823. The reversal of 81137376807 is 70867373118.

It is a happy number.

It is not a de Polignac number, because 81137376807 - 2³ = 81137376799 is a prime.

It is a super-2 number, since 2×81137376807² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 81137376807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81137376107) by changing a digit.

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, 41865583 + ... + 41867520.

It is an arithmetic number, because the mean of its divisors is an integer number (7535979360).

Almost surely, 2^81137376807 is an apocalyptic number.

81137376807 is a deficient number, since it is larger than the sum of its proper divisors (39438292953).

81137376807 is a wasteful number, since it uses less digits than its factorization.

81137376807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83733142.

The product of its (nonzero) digits is 1185408, while the sum is 51.

The spelling of 81137376807 in words is "eighty-one billion, one hundred thirty-seven million, three hundred seventy-six thousand, eight hundred seven".