81607242135 has 16 divisors (see below), whose sum is σ = 132224394240. Its totient is φ = 42972926880.

The previous prime is 81607242127. The next prime is 81607242139. The reversal of 81607242135 is 53124270618.

It is not a de Polignac number, because 81607242135 - 2³ = 81607242127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81607242093 and 81607242102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81607242139) 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, 34432251 + ... + 34434620.

It is an arithmetic number, because the mean of its divisors is an integer number (8264024640).

Almost surely, 2^81607242135 is an apocalyptic number.

81607242135 is a deficient number, since it is larger than the sum of its proper divisors (50617152105).

81607242135 is a wasteful number, since it uses less digits than its factorization.

81607242135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68866958.

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 81607242135 in words is "eighty-one billion, six hundred seven million, two hundred forty-two thousand, one hundred thirty-five".