251360065 has 16 divisors (see below), whose sum is σ = 331464960. Its totient is φ = 181467520.

The previous prime is 251360047. The next prime is 251360099. The reversal of 251360065 is 560063152.

It is not a de Polignac number, because 251360065 - 2¹⁷ = 251228993 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9145 + ... + 24214.

It is an arithmetic number, because the mean of its divisors is an integer number (20716560).

Almost surely, 2^251360065 is an apocalyptic number.

It is an amenable number.

251360065 is a deficient number, since it is larger than the sum of its proper divisors (80104895).

251360065 is a wasteful number, since it uses less digits than its factorization.

251360065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33512.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 251360065 is about 15854.3389959973. The cubic root of 251360065 is about 631.1008425810.

The spelling of 251360065 in words is "two hundred fifty-one million, three hundred sixty thousand, sixty-five".