2156664256244 has 6 divisors (see below), whose sum is σ = 3774162448434. Its totient is φ = 1078332128120.

The previous prime is 2156664256189. The next prime is 2156664256249. The reversal of 2156664256244 is 4426524666512.

It can be written as a sum of positive squares in only one way, i.e., 1355617776100 + 801046480144 = 1164310^2 + 895012^2 .

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 as a sum of consecutive naturals, namely, 269583032027 + ... + 269583032034.

It is an arithmetic number, because the mean of its divisors is an integer number (629027074739).

Almost surely, 2^{2156664256244} is an apocalyptic number.

It is an amenable number.

2156664256244 is a deficient number, since it is larger than the sum of its proper divisors (1617498192190).

2156664256244 is a wasteful number, since it uses less digits than its factorization.

2156664256244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539166064065 (or 539166064063 counting only the distinct ones).

The product of its digits is 16588800, while the sum is 53.

The spelling of 2156664256244 in words is "two trillion, one hundred fifty-six billion, six hundred sixty-four million, two hundred fifty-six thousand, two hundred forty-four".