646616855814 has 32 divisors (see below), whose sum is σ = 1332829196160. Its totient is φ = 209011828032.

The previous prime is 646616855809. The next prime is 646616855849. The reversal of 646616855814 is 418558616646.

It is a happy number.

It is a super-2 number, since 2×646616855814² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8979487 + ... + 9051210.

It is an arithmetic number, because the mean of its divisors is an integer number (41650912380).

Almost surely, 2^646616855814 is an apocalyptic number.

646616855814 is an abundant number, since it is smaller than the sum of its proper divisors (686212340346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646616855814 is a wasteful number, since it uses less digits than its factorization.

646616855814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18030884.

The product of its digits is 33177600, while the sum is 60.

The spelling of 646616855814 in words is "six hundred forty-six billion, six hundred sixteen million, eight hundred fifty-five thousand, eight hundred fourteen".