816860712959 has 4 divisors (see below), whose sum is σ = 817181934816. Its totient is φ = 816539491104.

The previous prime is 816860712851. The next prime is 816860712961. The reversal of 816860712959 is 959217068618.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 816860712959 - 2¹² = 816860708863 is a prime.

It is a super-2 number, since 2×816860712959² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816860712259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160607114 + ... + 160612199.

It is an arithmetic number, because the mean of its divisors is an integer number (204295483704).

Almost surely, 2^816860712959 is an apocalyptic number.

816860712959 is a deficient number, since it is larger than the sum of its proper divisors (321221857).

816860712959 is a wasteful number, since it uses less digits than its factorization.

816860712959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321221856.

The product of its (nonzero) digits is 13063680, while the sum is 62.

The spelling of 816860712959 in words is "eight hundred sixteen billion, eight hundred sixty million, seven hundred twelve thousand, nine hundred fifty-nine".