2156644976704 has 21 divisors (see below), whose sum is σ = 4279615689037. Its totient is φ = 1078316614144.

The previous prime is 2156644976659. The next prime is 2156644976719. The reversal of 2156644976704 is 4076794466512.

It is a happy number.

The square root of 2156644976704 is 1468552.

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., 815495690304 + 1341149286400 = 903048^2 + 1158080^2 .

It is a super-2 number, since 2×2156644976704² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 11656632 + ... + 11840200.

Almost surely, 2^{2156644976704} is an apocalyptic number.

2156644976704 is the 1468552-nd square number.

It is an amenable number.

2156644976704 is a deficient number, since it is larger than the sum of its proper divisors (2122970712333).

2156644976704 is an frugal number, since it uses more digits than its factorization.

2156644976704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367150 (or 183571 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 61.

The spelling of 2156644976704 in words is "two trillion, one hundred fifty-six billion, six hundred forty-four million, nine hundred seventy-six thousand, seven hundred four".