81886913268790 has 32 divisors (see below), whose sum is σ = 168454918667520. Its totient is φ = 28075206463584.

The previous prime is 81886913268739. The next prime is 81886913268829. The reversal of 81886913268790 is 9786231968818.

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, 112749 + ... + 12797911.

It is an arithmetic number, because the mean of its divisors is an integer number (5264216208360).

Almost surely, 2^{81886913268790} is an apocalyptic number.

81886913268790 is an abundant number, since it is smaller than the sum of its proper divisors (86568005398730).

81886913268790 is a wasteful number, since it uses less digits than its factorization.

81886913268790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12777396.

The product of its (nonzero) digits is 501645312, while the sum is 76.

The spelling of 81886913268790 in words is "eighty-one trillion, eight hundred eighty-six billion, nine hundred thirteen million, two hundred sixty-eight thousand, seven hundred ninety".