81165508935 has 16 divisors (see below), whose sum is σ = 148416930816. Its totient is φ = 37104232608.

The previous prime is 81165508927. The next prime is 81165508939. The reversal of 81165508935 is 53980556118.

It is a happy number.

It is not a de Polignac number, because 81165508935 - 2³ = 81165508927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81165508939) 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, 386502319 + ... + 386502528.

It is an arithmetic number, because the mean of its divisors is an integer number (9276058176).

Almost surely, 2^81165508935 is an apocalyptic number.

81165508935 is a deficient number, since it is larger than the sum of its proper divisors (67251421881).

81165508935 is a wasteful number, since it uses less digits than its factorization.

81165508935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773004862.

The product of its (nonzero) digits is 1296000, while the sum is 51.

The spelling of 81165508935 in words is "eighty-one billion, one hundred sixty-five million, five hundred eight thousand, nine hundred thirty-five".