256354657519 has 2 divisors, whose sum is σ = 256354657520. Its totient is φ = 256354657518.

The previous prime is 256354657477. The next prime is 256354657523. The reversal of 256354657519 is 915756453652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256354657519 is a prime.

It is a super-2 number, since 2×256354657519² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256354657549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128177328759 + 128177328760.

It is an arithmetic number, because the mean of its divisors is an integer number (128177328760).

Almost surely, 2^256354657519 is an apocalyptic number.

256354657519 is a deficient number, since it is larger than the sum of its proper divisors (1).

256354657519 is an equidigital number, since it uses as much as digits as its factorization.

256354657519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020000, while the sum is 58.

The spelling of 256354657519 in words is "two hundred fifty-six billion, three hundred fifty-four million, six hundred fifty-seven thousand, five hundred nineteen".