6556897694736 has 75 divisors (see below), whose sum is σ = 18977831047021. Its totient is φ = 2185601837184.

The previous prime is 6556897694719. The next prime is 6556897694801. The reversal of 6556897694736 is 6374967986556.

The square root of 6556897694736 is 2560644.

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

6556897694736 is a `hidden beast` number, since 6 + 5 + 5 + 6 + 89 + 7 + 69 + 473 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1321221509136 + 5235676185600 = 1149444^2 + 2288160^2 .

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 92147620 + ... + 92218748.

Almost surely, 2^{6556897694736} is an apocalyptic number.

6556897694736 is the 2560644-th square number.

It is an amenable number.

6556897694736 is an abundant number, since it is smaller than the sum of its proper divisors (12420933352285).

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

6556897694736 is an frugal number, since it uses more digits than its factorization.

6556897694736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142278 (or 71134 counting only the distinct ones).

The product of its digits is 12345177600, while the sum is 81.

Multiplying 6556897694736 by its sum of digits (81), we get a square (531108713273616 = 23045796²).

6556897694736 divided by its sum of digits (81) gives a square (80949354256 = 284516²).

The spelling of 6556897694736 in words is "six trillion, five hundred fifty-six billion, eight hundred ninety-seven million, six hundred ninety-four thousand, seven hundred thirty-six".