256516742266325 has 6 divisors (see below), whose sum is σ = 318080760410274. Its totient is φ = 205213393813040.

The previous prime is 256516742266319. The next prime is 256516742266451. The reversal of 256516742266325 is 523662247615652.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 9671857421521 + 246844884844804 = 3109961^2 + 15711298^2 .

It is a de Polignac number, because none of the positive numbers 2^k-256516742266325 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5130334845302 + ... + 5130334845351.

It is an arithmetic number, because the mean of its divisors is an integer number (53013460068379).

Almost surely, 2^{256516742266325} is an apocalyptic number.

256516742266325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256516742266325 is a deficient number, since it is larger than the sum of its proper divisors (61564018143949).

256516742266325 is a wasteful number, since it uses less digits than its factorization.

256516742266325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10260669690663 (or 10260669690658 counting only the distinct ones).

The product of its digits is 217728000, while the sum is 62.

The spelling of 256516742266325 in words is "two hundred fifty-six trillion, five hundred sixteen billion, seven hundred forty-two million, two hundred sixty-six thousand, three hundred twenty-five".