251145569552 has 20 divisors (see below), whose sum is σ = 499745745996. Its totient is φ = 122178925440.

The previous prime is 251145569509. The next prime is 251145569557. The reversal of 251145569552 is 255965541152.

It can be written as a sum of positive squares in 2 ways, for example, as 140307179776 + 110838389776 = 374576^2 + 332924^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 251145569552.

It is not an unprimeable number, because it can be changed into a prime (251145569557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212115599 + ... + 212116782.

Almost surely, 2^251145569552 is an apocalyptic number.

It is an amenable number.

251145569552 is a deficient number, since it is larger than the sum of its proper divisors (248600176444).

251145569552 is a wasteful number, since it uses less digits than its factorization.

251145569552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424232426 (or 424232420 counting only the distinct ones).

The product of its digits is 2700000, while the sum is 50.

The spelling of 251145569552 in words is "two hundred fifty-one billion, one hundred forty-five million, five hundred sixty-nine thousand, five hundred fifty-two".