251713275505 has 32 divisors (see below), whose sum is σ = 326008986624. Its totient is φ = 185863382016.

The previous prime is 251713275469. The next prime is 251713275563. The reversal of 251713275505 is 505572317152.

It is a cyclic number.

It is not a de Polignac number, because 251713275505 - 2⁹ = 251713274993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10723692 + ... + 10747138.

It is an arithmetic number, because the mean of its divisors is an integer number (10187780832).

Almost surely, 2^251713275505 is an apocalyptic number.

It is an amenable number.

251713275505 is a deficient number, since it is larger than the sum of its proper divisors (74295711119).

251713275505 is a wasteful number, since it uses less digits than its factorization.

251713275505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25905.

The product of its (nonzero) digits is 367500, while the sum is 43.

The spelling of 251713275505 in words is "two hundred fifty-one billion, seven hundred thirteen million, two hundred seventy-five thousand, five hundred five".