256526155124737 has 4 divisors (see below), whose sum is σ = 261366271259220. Its totient is φ = 251686038990256.

The previous prime is 256526155124719. The next prime is 256526155124797. The reversal of 256526155124737 is 737421551625652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 108039476793616 + 148486678331121 = 10394204^2 + 12185511^2 .

It is a cyclic number.

It is not a de Polignac number, because 256526155124737 - 2¹¹ = 256526155122689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256526155124797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2420058067162 + ... + 2420058067267.

It is an arithmetic number, because the mean of its divisors is an integer number (65341567814805).

Almost surely, 2^{256526155124737} is an apocalyptic number.

It is an amenable number.

256526155124737 is a deficient number, since it is larger than the sum of its proper divisors (4840116134483).

256526155124737 is an equidigital number, since it uses as much as digits as its factorization.

256526155124737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840116134482.

The product of its digits is 105840000, while the sum is 61.

The spelling of 256526155124737 in words is "two hundred fifty-six trillion, five hundred twenty-six billion, one hundred fifty-five million, one hundred twenty-four thousand, seven hundred thirty-seven".