251533522213969 has 2 divisors, whose sum is σ = 251533522213970. Its totient is φ = 251533522213968.

The previous prime is 251533522213927. The next prime is 251533522214021. The reversal of 251533522213969 is 969312225335152.

251533522213969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249757312978944 + 1776209235025 = 15803712^2 + 1332745^2 .

It is a cyclic number.

It is not a de Polignac number, because 251533522213969 - 2³⁵ = 251499162475601 is a prime.

It is a super-2 number, since 2×251533522213969² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251533522213069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125766761106984 + 125766761106985.

It is an arithmetic number, because the mean of its divisors is an integer number (125766761106985).

Almost surely, 2^{251533522213969} is an apocalyptic number.

It is an amenable number.

251533522213969 is a deficient number, since it is larger than the sum of its proper divisors (1).

251533522213969 is an equidigital number, since it uses as much as digits as its factorization.

251533522213969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244000, while the sum is 58.

The spelling of 251533522213969 in words is "two hundred fifty-one trillion, five hundred thirty-three billion, five hundred twenty-two million, two hundred thirteen thousand, nine hundred sixty-nine".