256011513613 has 8 divisors (see below), whose sum is σ = 265404162816. Its totient is φ = 246689752800.

The previous prime is 256011513557. The next prime is 256011513643. The reversal of 256011513613 is 316315110652.

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 256011513613 - 2²¹ = 256009416461 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 (256011513643) 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, 17714743 + ... + 17729188.

It is an arithmetic number, because the mean of its divisors is an integer number (33175520352).

Almost surely, 2^256011513613 is an apocalyptic number.

It is an amenable number.

256011513613 is a deficient number, since it is larger than the sum of its proper divisors (9392649203).

256011513613 is a wasteful number, since it uses less digits than its factorization.

256011513613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35444195.

The product of its (nonzero) digits is 16200, while the sum is 34.

The spelling of 256011513613 in words is "two hundred fifty-six billion, eleven million, five hundred thirteen thousand, six hundred thirteen".