256388477545 has 8 divisors (see below), whose sum is σ = 307805844096. Its totient is φ = 205017668016.

The previous prime is 256388477537. The next prime is 256388477633. The reversal of 256388477545 is 545774883652.

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 256388477545 - 2³ = 256388477537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11627137 + ... + 11649166.

It is an arithmetic number, because the mean of its divisors is an integer number (38475730512).

Almost surely, 2^256388477545 is an apocalyptic number.

It is an amenable number.

256388477545 is a deficient number, since it is larger than the sum of its proper divisors (51417366551).

256388477545 is a wasteful number, since it uses less digits than its factorization.

256388477545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23278511.

The product of its digits is 225792000, while the sum is 64.

The spelling of 256388477545 in words is "two hundred fifty-six billion, three hundred eighty-eight million, four hundred seventy-seven thousand, five hundred forty-five".