256623324477901 has 2 divisors, whose sum is σ = 256623324477902. Its totient is φ = 256623324477900.

The previous prime is 256623324477893. The next prime is 256623324477959. The reversal of 256623324477901 is 109774423326652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163776031845001 + 92847292632900 = 12797501^2 + 9635730^2 .

It is a cyclic number.

It is not a de Polignac number, because 256623324477901 - 2³ = 256623324477893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256623324477901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256623324472901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128311662238950 + 128311662238951.

It is an arithmetic number, because the mean of its divisors is an integer number (128311662238951).

Almost surely, 2^{256623324477901} is an apocalyptic number.

It is an amenable number.

256623324477901 is a deficient number, since it is larger than the sum of its proper divisors (1).

256623324477901 is an equidigital number, since it uses as much as digits as its factorization.

256623324477901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91445760, while the sum is 61.

The spelling of 256623324477901 in words is "two hundred fifty-six trillion, six hundred twenty-three billion, three hundred twenty-four million, four hundred seventy-seven thousand, nine hundred one".