2156664256245 has 40 divisors (see below), whose sum is σ = 3868631858520. Its totient is φ = 1149443965440.

The previous prime is 2156664256189. The next prime is 2156664256249. The reversal of 2156664256245 is 5426524666512.

It can be written as a sum of positive squares in 4 ways, for example, as 206267663889 + 1950396592356 = 454167^2 + 1396566^2 .

It is not a de Polignac number, because 2156664256245 - 2⁸ = 2156664255989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2156664256191 and 2156664256200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156664256249) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1198000 + ... + 2397609.

It is an arithmetic number, because the mean of its divisors is an integer number (96715796463).

Almost surely, 2^{2156664256245} is an apocalyptic number.

It is an amenable number.

2156664256245 is a deficient number, since it is larger than the sum of its proper divisors (1711967602275).

2156664256245 is a wasteful number, since it uses less digits than its factorization.

2156664256245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3597107 (or 3597098 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 54.

The spelling of 2156664256245 in words is "two trillion, one hundred fifty-six billion, six hundred sixty-four million, two hundred fifty-six thousand, two hundred forty-five".