256470477715 has 8 divisors (see below), whose sum is σ = 308852082288. Its totient is φ = 204451376160.

The previous prime is 256470477709. The next prime is 256470477719. The reversal of 256470477715 is 517774074652.

It is a happy number.

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

It is not a de Polignac number, because 256470477715 - 2⁷ = 256470477587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256470477719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90624196 + ... + 90627025.

It is an arithmetic number, because the mean of its divisors is an integer number (38606510286).

Almost surely, 2^256470477715 is an apocalyptic number.

256470477715 is a deficient number, since it is larger than the sum of its proper divisors (52381604573).

256470477715 is a wasteful number, since it uses less digits than its factorization.

256470477715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181251509.

The product of its (nonzero) digits is 11524800, while the sum is 55.

The spelling of 256470477715 in words is "two hundred fifty-six billion, four hundred seventy million, four hundred seventy-seven thousand, seven hundred fifteen".