256218135688277 has 8 divisors (see below), whose sum is σ = 297783789662400. Its totient is φ = 215893247504544.

The previous prime is 256218135688261. The next prime is 256218135688301. The reversal of 256218135688277 is 772886531812652.

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 256218135688277 - 2⁴ = 256218135688261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256218135688277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256218135687277) 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, 310191447152 + ... + 310191447977.

It is an arithmetic number, because the mean of its divisors is an integer number (37222973707800).

Almost surely, 2^{256218135688277} is an apocalyptic number.

It is an amenable number.

256218135688277 is a deficient number, since it is larger than the sum of its proper divisors (41565653974123).

256218135688277 is an equidigital number, since it uses as much as digits as its factorization.

256218135688277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620382895195.

The product of its digits is 541900800, while the sum is 71.

The spelling of 256218135688277 in words is "two hundred fifty-six trillion, two hundred eighteen billion, one hundred thirty-five million, six hundred eighty-eight thousand, two hundred seventy-seven".