256304565407 has 8 divisors (see below), whose sum is σ = 284188669392. Its totient is φ = 229184409600.

The previous prime is 256304565389. The next prime is 256304565409. The reversal of 256304565407 is 704565403652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256304565407 - 2⁸ = 256304565151 is a prime.

It is a super-2 number, since 2×256304565407² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256304565409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190986338 + ... + 190987679.

It is an arithmetic number, because the mean of its divisors is an integer number (35523583674).

Almost surely, 2^256304565407 is an apocalyptic number.

256304565407 is a deficient number, since it is larger than the sum of its proper divisors (27884103985).

256304565407 is a wasteful number, since it uses less digits than its factorization.

256304565407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381974089.

The product of its (nonzero) digits is 3024000, while the sum is 47.

The spelling of 256304565407 in words is "two hundred fifty-six billion, three hundred four million, five hundred sixty-five thousand, four hundred seven".