256510050467621 has 2 divisors, whose sum is σ = 256510050467622. Its totient is φ = 256510050467620.

The previous prime is 256510050467599. The next prime is 256510050467633. The reversal of 256510050467621 is 126764050015652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256467733452100 + 42317015521 = 16014610^2 + 205711^2 .

It is a cyclic number.

It is not a de Polignac number, because 256510050467621 - 2²² = 256510046273317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256510050467621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256510050167621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128255025233810 + 128255025233811.

It is an arithmetic number, because the mean of its divisors is an integer number (128255025233811).

Almost surely, 2^{256510050467621} is an apocalyptic number.

It is an amenable number.

256510050467621 is a deficient number, since it is larger than the sum of its proper divisors (1).

256510050467621 is an equidigital number, since it uses as much as digits as its factorization.

256510050467621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024000, while the sum is 50.

The spelling of 256510050467621 in words is "two hundred fifty-six trillion, five hundred ten billion, fifty million, four hundred sixty-seven thousand, six hundred twenty-one".