2256455156521 has 2 divisors, whose sum is σ = 2256455156522. Its totient is φ = 2256455156520.

The previous prime is 2256455156477. The next prime is 2256455156561. The reversal of 2256455156521 is 1256515546522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2199775450896 + 56679705625 = 1483164^2 + 238075^2 .

It is a cyclic number.

It is not a de Polignac number, because 2256455156521 - 2⁷ = 2256455156393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2256455156561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128227578260 + 1128227578261.

It is an arithmetic number, because the mean of its divisors is an integer number (1128227578261).

Almost surely, 2^{2256455156521} is an apocalyptic number.

It is an amenable number.

2256455156521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2256455156521 is an equidigital number, since it uses as much as digits as its factorization.

2256455156521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600000, while the sum is 49.

The spelling of 2256455156521 in words is "two trillion, two hundred fifty-six billion, four hundred fifty-five million, one hundred fifty-six thousand, five hundred twenty-one".