256566470207 has 4 divisors (see below), whose sum is σ = 256591905576. Its totient is φ = 256541034840.

The previous prime is 256566470201. The next prime is 256566470221. The reversal of 256566470207 is 702074665652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256566470207 - 2¹² = 256566466111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256566470201) 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, 12702548 + ... + 12722729.

It is an arithmetic number, because the mean of its divisors is an integer number (64147976394).

Almost surely, 2^256566470207 is an apocalyptic number.

256566470207 is a deficient number, since it is larger than the sum of its proper divisors (25435369).

256566470207 is a wasteful number, since it uses less digits than its factorization.

256566470207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25435368.

The product of its (nonzero) digits is 4233600, while the sum is 50.

The spelling of 256566470207 in words is "two hundred fifty-six billion, five hundred sixty-six million, four hundred seventy thousand, two hundred seven".