256615411121 has 16 divisors (see below), whose sum is σ = 262008624000. Its totient is φ = 251270667648.

The previous prime is 256615411109. The next prime is 256615411133. The reversal of 256615411121 is 121114516652.

It is an interprime number because it is at equal distance from previous prime (256615411109) and next prime (256615411133).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256615411121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256615411181) 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, 14564165 + ... + 14581773.

It is an arithmetic number, because the mean of its divisors is an integer number (16375539000).

Almost surely, 2^256615411121 is an apocalyptic number.

It is an amenable number.

256615411121 is a deficient number, since it is larger than the sum of its proper divisors (5393212879).

256615411121 is a wasteful number, since it uses less digits than its factorization.

256615411121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18968.

The product of its digits is 14400, while the sum is 35.

Adding to 256615411121 its reverse (121114516652), we get a palindrome (377729927773).

The spelling of 256615411121 in words is "two hundred fifty-six billion, six hundred fifteen million, four hundred eleven thousand, one hundred twenty-one".