814978601646 has 16 divisors (see below), whose sum is σ = 1778135131008. Its totient is φ = 246963212600.

The previous prime is 814978601617. The next prime is 814978601653. The reversal of 814978601646 is 646106879418.

It is a super-2 number, since 2×814978601646² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 814978601646.

It is a congruent number.

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, 6174080250 + ... + 6174080381.

It is an arithmetic number, because the mean of its divisors is an integer number (111133445688).

Almost surely, 2^814978601646 is an apocalyptic number.

814978601646 is an abundant number, since it is smaller than the sum of its proper divisors (963156529362).

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

814978601646 is a wasteful number, since it uses less digits than its factorization.

814978601646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12348160647.

The product of its (nonzero) digits is 13934592, while the sum is 60.

The spelling of 814978601646 in words is "eight hundred fourteen billion, nine hundred seventy-eight million, six hundred one thousand, six hundred forty-six".