256455705751 has 8 divisors (see below), whose sum is σ = 293103956480. Its totient is φ = 219810385368.

The previous prime is 256455705749. The next prime is 256455705773. The reversal of 256455705751 is 157507554652.

It is a happy number.

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

It is not a de Polignac number, because 256455705751 - 2¹ = 256455705749 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 (256455705151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541731 + ... + 897988.

It is an arithmetic number, because the mean of its divisors is an integer number (36637994560).

Almost surely, 2^256455705751 is an apocalyptic number.

256455705751 is a deficient number, since it is larger than the sum of its proper divisors (36648250729).

256455705751 is a wasteful number, since it uses less digits than its factorization.

256455705751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465173.

The product of its (nonzero) digits is 7350000, while the sum is 52.

The spelling of 256455705751 in words is "two hundred fifty-six billion, four hundred fifty-five million, seven hundred five thousand, seven hundred fifty-one".