6400566044356 has 27 divisors (see below), whose sum is σ = 12311939681517. Its totient is φ = 2909322902640.

The previous prime is 6400566044297. The next prime is 6400566044399. The reversal of 6400566044356 is 6534406650046.

The square root of 6400566044356 is 2529934.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1621165562500 + 4779400481856 = 1273250^2 + 2186184^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 55601050 + ... + 55716046.

Almost surely, 2^{6400566044356} is an apocalyptic number.

6400566044356 is the 2529934-th square number.

It is an amenable number.

6400566044356 is a deficient number, since it is larger than the sum of its proper divisors (5911373637161).

6400566044356 is an frugal number, since it uses more digits than its factorization.

6400566044356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230020 (or 115010 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 49.

Multiplying 6400566044356 by its sum of digits (49), we get a square (313627736173444 = 17709538²).

The spelling of 6400566044356 in words is "six trillion, four hundred billion, five hundred sixty-six million, forty-four thousand, three hundred fifty-six".