2156444564351 has 16 divisors (see below), whose sum is σ = 2761217894400. Its totient is φ = 1634931643680.

The previous prime is 2156444564333. The next prime is 2156444564371. The reversal of 2156444564351 is 1534654446512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2156444564351 - 2²⁶ = 2156377455487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2156444564351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156444564371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378453551 + ... + 378459248.

It is an arithmetic number, because the mean of its divisors is an integer number (172576118400).

Almost surely, 2^{2156444564351} is an apocalyptic number.

2156444564351 is a deficient number, since it is larger than the sum of its proper divisors (604773330049).

2156444564351 is a wasteful number, since it uses less digits than its factorization.

2156444564351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756912854.

The product of its digits is 6912000, while the sum is 50.

The spelling of 2156444564351 in words is "two trillion, one hundred fifty-six billion, four hundred forty-four million, five hundred sixty-four thousand, three hundred fifty-one".