256064651 has 4 divisors (see below), whose sum is σ = 256203672. Its totient is φ = 255925632.

The previous prime is 256064623. The next prime is 256064657. The reversal of 256064651 is 156460652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256064651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256064657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66710 + ... + 70443.

It is an arithmetic number, because the mean of its divisors is an integer number (64050918).

Almost surely, 2^256064651 is an apocalyptic number.

256064651 is a deficient number, since it is larger than the sum of its proper divisors (139021).

256064651 is a wasteful number, since it uses less digits than its factorization.

256064651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139020.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 256064651 is about 16002.0202162102. The cubic root of 256064651 is about 635.0138678849.

The spelling of 256064651 in words is "two hundred fifty-six million, sixty-four thousand, six hundred fifty-one".