651256065 has 32 divisors (see below), whose sum is σ = 1218729600. Its totient is φ = 329054400.

The previous prime is 651256057. The next prime is 651256087. The reversal of 651256065 is 560652156.

It is a happy number.

It is not a de Polignac number, because 651256065 - 2³ = 651256057 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124386 + ... + 129515.

It is an arithmetic number, because the mean of its divisors is an integer number (38085300).

Almost surely, 2^651256065 is an apocalyptic number.

It is an amenable number.

651256065 is a deficient number, since it is larger than the sum of its proper divisors (567473535).

651256065 is a wasteful number, since it uses less digits than its factorization.

651256065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253934 (or 253928 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 651256065 is about 25519.7191403040. The cubic root of 651256065 is about 866.7967220176.

The spelling of 651256065 in words is "six hundred fifty-one million, two hundred fifty-six thousand, sixty-five".