251264641242 has 32 divisors (see below), whose sum is σ = 510120663552. Its totient is φ = 82490096304.

The previous prime is 251264641163. The next prime is 251264641249. The reversal of 251264641242 is 242146462152.

It is a self number, because there is not a number n which added to its sum of digits gives 251264641242.

It is not an unprimeable number, because it can be changed into a prime (251264641249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2328283 + ... + 2433809.

It is an arithmetic number, because the mean of its divisors is an integer number (15941270736).

Almost surely, 2^251264641242 is an apocalyptic number.

251264641242 is an abundant number, since it is smaller than the sum of its proper divisors (258856022310).

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

251264641242 is a wasteful number, since it uses less digits than its factorization.

251264641242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111522.

The product of its digits is 184320, while the sum is 39.

The spelling of 251264641242 in words is "two hundred fifty-one billion, two hundred sixty-four million, six hundred forty-one thousand, two hundred forty-two".