816859252863 has 12 divisors (see below), whose sum is σ = 1179918721800. Its totient is φ = 544567798896.

The previous prime is 816859252837. The next prime is 816859252901. The reversal of 816859252863 is 368252958618.

816859252863 is a `hidden beast` number, since 8 + 16 + 8 + 5 + 92 + 528 + 6 + 3 = 666.

It is not a de Polignac number, because 816859252863 - 2²⁰ = 816858204287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816859252863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816859252463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 791488 + ... + 1503386.

It is an arithmetic number, because the mean of its divisors is an integer number (98326560150).

Almost surely, 2^816859252863 is an apocalyptic number.

816859252863 is a deficient number, since it is larger than the sum of its proper divisors (363059468937).

816859252863 is a wasteful number, since it uses less digits than its factorization.

816859252863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839398 (or 839395 counting only the distinct ones).

The product of its digits is 49766400, while the sum is 63.

The spelling of 816859252863 in words is "eight hundred sixteen billion, eight hundred fifty-nine million, two hundred fifty-two thousand, eight hundred sixty-three".