251873399742 has 48 divisors (see below), whose sum is σ = 510308127120. Its totient is φ = 82878132096.

The previous prime is 251873399731. The next prime is 251873399779. The reversal of 251873399742 is 247993378152.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86345268 + ... + 86348184.

It is an arithmetic number, because the mean of its divisors is an integer number (10631419315).

Almost surely, 2^251873399742 is an apocalyptic number.

251873399742 is an abundant number, since it is smaller than the sum of its proper divisors (258434727378).

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

251873399742 is a wasteful number, since it uses less digits than its factorization.

251873399742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5177 (or 5094 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 60.

The spelling of 251873399742 in words is "two hundred fifty-one billion, eight hundred seventy-three million, three hundred ninety-nine thousand, seven hundred forty-two".