251229908168 has 12 divisors (see below), whose sum is σ = 471058735995. Its totient is φ = 125614245240.

The previous prime is 251229908161. The next prime is 251229908177. The reversal of 251229908168 is 861809922152.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 125614954084 + 125614954084 = 354422^2 + 354422^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=354422.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251229908161) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1329083 + ... + 1506293.

Almost surely, 2^251229908168 is an apocalyptic number.

It is an amenable number.

251229908168 is a deficient number, since it is larger than the sum of its proper divisors (219828827827).

251229908168 is an frugal number, since it uses more digits than its factorization.

251229908168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354428 (or 177213 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 53.

The spelling of 251229908168 in words is "two hundred fifty-one billion, two hundred twenty-nine million, nine hundred eight thousand, one hundred sixty-eight".