256164213553 has 2 divisors, whose sum is σ = 256164213554. Its totient is φ = 256164213552.

The previous prime is 256164213521. The next prime is 256164213577. The reversal of 256164213553 is 355312461652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210945466944 + 45218746609 = 459288^2 + 212647^2 .

It is a cyclic number.

It is not a de Polignac number, because 256164213553 - 2⁵ = 256164213521 is a prime.

It is not a weakly prime, because it can be changed into another prime (256164213583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128082106776 + 128082106777.

It is an arithmetic number, because the mean of its divisors is an integer number (128082106777).

Almost surely, 2^256164213553 is an apocalyptic number.

It is an amenable number.

256164213553 is a deficient number, since it is larger than the sum of its proper divisors (1).

256164213553 is an equidigital number, since it uses as much as digits as its factorization.

256164213553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 43.

The spelling of 256164213553 in words is "two hundred fifty-six billion, one hundred sixty-four million, two hundred thirteen thousand, five hundred fifty-three".