256516606613771 has 4 divisors (see below), whose sum is σ = 293161836130032. Its totient is φ = 219871377097512.

The previous prime is 256516606613749. The next prime is 256516606613831. The reversal of 256516606613771 is 177316606615652.

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

It is not a de Polignac number, because 256516606613771 - 2³⁰ = 256515532871947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256516606613741) 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, 18322614758120 + ... + 18322614758133.

It is an arithmetic number, because the mean of its divisors is an integer number (73290459032508).

Almost surely, 2^{256516606613771} is an apocalyptic number.

256516606613771 is a deficient number, since it is larger than the sum of its proper divisors (36645229516261).

256516606613771 is an equidigital number, since it uses as much as digits as its factorization.

256516606613771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36645229516260.

The product of its (nonzero) digits is 57153600, while the sum is 62.

The spelling of 256516606613771 in words is "two hundred fifty-six trillion, five hundred sixteen billion, six hundred six million, six hundred thirteen thousand, seven hundred seventy-one".