81717380146 has 16 divisors (see below), whose sum is σ = 123856508160. Its totient is φ = 40431991680.

The previous prime is 81717380137. The next prime is 81717380159. The reversal of 81717380146 is 64108371718.

It is a junction number, because it is equal to n+sod(n) for n = 81717380096 and 81717380105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1667331 + ... + 1715641.

It is an arithmetic number, because the mean of its divisors is an integer number (7741031760).

Almost surely, 2^81717380146 is an apocalyptic number.

81717380146 is a deficient number, since it is larger than the sum of its proper divisors (42139128014).

81717380146 is a wasteful number, since it uses less digits than its factorization.

81717380146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57129.

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 81717380146 in words is "eighty-one billion, seven hundred seventeen million, three hundred eighty thousand, one hundred forty-six".