251551146424552 has 64 divisors (see below), whose sum is σ = 523334591171280. Its totient is φ = 112601773320192.

The previous prime is 251551146424549. The next prime is 251551146424579. The reversal of 251551146424552 is 255424641155152.

It can be written as a sum of positive squares in 8 ways, for example, as 4166881194436 + 247384265230116 = 2041294^2 + 15728454^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a self number, because there is not a number n which added to its sum of digits gives 251551146424552.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103223563 + ... + 105632410.

Almost surely, 2^{251551146424552} is an apocalyptic number.

It is an amenable number.

251551146424552 is an abundant number, since it is smaller than the sum of its proper divisors (271783444746728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251551146424552 is a wasteful number, since it uses less digits than its factorization.

251551146424552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208856342 (or 208856338 counting only the distinct ones).

The product of its digits is 9600000, while the sum is 52.

The spelling of 251551146424552 in words is "two hundred fifty-one trillion, five hundred fifty-one billion, one hundred forty-six million, four hundred twenty-four thousand, five hundred fifty-two".