256506335434677 has 8 divisors (see below), whose sum is σ = 342008883807040. Its totient is φ = 171004005342720.

The previous prime is 256506335434669. The next prime is 256506335434681. The reversal of 256506335434677 is 776434533605652.

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

It is not a de Polignac number, because 256506335434677 - 2³ = 256506335434669 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 (256506335434607) 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, 51808177 + ... + 56542902.

It is an arithmetic number, because the mean of its divisors is an integer number (42751110475880).

Almost surely, 2^{256506335434677} is an apocalyptic number.

It is an amenable number.

256506335434677 is a deficient number, since it is larger than the sum of its proper divisors (85502548372363).

256506335434677 is a wasteful number, since it uses less digits than its factorization.

256506335434677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109140203.

The product of its (nonzero) digits is 1143072000, while the sum is 66.

The spelling of 256506335434677 in words is "two hundred fifty-six trillion, five hundred six billion, three hundred thirty-five million, four hundred thirty-four thousand, six hundred seventy-seven".