81146611685 has 16 divisors (see below), whose sum is σ = 102413652480. Its totient is φ = 61637833920.

The previous prime is 81146611657. The next prime is 81146611709. The reversal of 81146611685 is 58611664118.

It is not a de Polignac number, because 81146611685 - 2¹² = 81146607589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4930715 + ... + 4947144.

It is an arithmetic number, because the mean of its divisors is an integer number (6400853280).

Almost surely, 2^81146611685 is an apocalyptic number.

It is an amenable number.

81146611685 is a deficient number, since it is larger than the sum of its proper divisors (21267040795).

81146611685 is a wasteful number, since it uses less digits than its factorization.

81146611685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9877948.

The product of its digits is 276480, while the sum is 47.

The spelling of 81146611685 in words is "eighty-one billion, one hundred forty-six million, six hundred eleven thousand, six hundred eighty-five".