256623463601 has 2 divisors, whose sum is σ = 256623463602. Its totient is φ = 256623463600.

The previous prime is 256623463561. The next prime is 256623463609. The reversal of 256623463601 is 106364326652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136231119025 + 120392344576 = 369095^2 + 346976^2 .

It is a cyclic number.

It is not a de Polignac number, because 256623463601 - 2¹⁰ = 256623462577 is a prime.

It is not a weakly prime, because it can be changed into another prime (256623463609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128311731800 + 128311731801.

It is an arithmetic number, because the mean of its divisors is an integer number (128311731801).

Almost surely, 2^256623463601 is an apocalyptic number.

It is an amenable number.

256623463601 is a deficient number, since it is larger than the sum of its proper divisors (1).

256623463601 is an equidigital number, since it uses as much as digits as its factorization.

256623463601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 44.

The spelling of 256623463601 in words is "two hundred fifty-six billion, six hundred twenty-three million, four hundred sixty-three thousand, six hundred one".