256252662121 has 2 divisors, whose sum is σ = 256252662122. Its totient is φ = 256252662120.

The previous prime is 256252662101. The next prime is 256252662181. The reversal of 256252662121 is 121266252652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213618671721 + 42633990400 = 462189^2 + 206480^2 .

It is a cyclic number.

It is not a de Polignac number, because 256252662121 - 2³⁵ = 221892923753 is a prime.

It is not a weakly prime, because it can be changed into another prime (256252662101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128126331060 + 128126331061.

It is an arithmetic number, because the mean of its divisors is an integer number (128126331061).

Almost surely, 2^256252662121 is an apocalyptic number.

It is an amenable number.

256252662121 is a deficient number, since it is larger than the sum of its proper divisors (1).

256252662121 is an equidigital number, since it uses as much as digits as its factorization.

256252662121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 40.

The spelling of 256252662121 in words is "two hundred fifty-six billion, two hundred fifty-two million, six hundred sixty-two thousand, one hundred twenty-one".