256353060613 has 16 divisors (see below), whose sum is σ = 276573636976. Its totient is φ = 236204398080.

The previous prime is 256353060581. The next prime is 256353060671. The reversal of 256353060613 is 316060353652.

256353060613 = 358017² + 358018².

It is a happy number.

It is the 206702-nd star number.

It can be written as a sum of positive squares in 8 ways, for example, as 37163357284 + 219189703329 = 192778^2 + 468177^2 .

It is a cyclic number.

It is not a de Polignac number, because 256353060613 - 2⁵ = 256353060581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256353060673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24803995 + ... + 24814327.

It is an arithmetic number, because the mean of its divisors is an integer number (17285852311).

Almost surely, 2^256353060613 is an apocalyptic number.

256353060613 is the 358018-th centered square number.

It is an amenable number.

256353060613 is a deficient number, since it is larger than the sum of its proper divisors (20220576363).

256353060613 is a wasteful number, since it uses less digits than its factorization.

256353060613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13624.

The product of its (nonzero) digits is 291600, while the sum is 40.

The spelling of 256353060613 in words is "two hundred fifty-six billion, three hundred fifty-three million, sixty thousand, six hundred thirteen".