812708212565 has 16 divisors (see below), whose sum is σ = 1032646339440. Its totient is φ = 611904384000.

The previous prime is 812708212541. The next prime is 812708212573. The reversal of 812708212565 is 565212807218.

It can be written as a sum of positive squares in 8 ways, for example, as 24373766641 + 788334445924 = 156121^2 + 887882^2 .

It is not a de Polignac number, because 812708212565 - 2²⁸ = 812439777109 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, 3507815 + ... + 3732315.

It is an arithmetic number, because the mean of its divisors is an integer number (64540396215).

Almost surely, 2^812708212565 is an apocalyptic number.

812708212565 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

812708212565 is a deficient number, since it is larger than the sum of its proper divisors (219938126875).

812708212565 is a wasteful number, since it uses less digits than its factorization.

812708212565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267112.

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 812708212565 in words is "eight hundred twelve billion, seven hundred eight million, two hundred twelve thousand, five hundred sixty-five".