256887201583 has 2 divisors, whose sum is σ = 256887201584. Its totient is φ = 256887201582.

The previous prime is 256887201577. The next prime is 256887201601. The reversal of 256887201583 is 385102788652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256887201583 - 2³³ = 248297266991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256887201283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128443600791 + 128443600792.

It is an arithmetic number, because the mean of its divisors is an integer number (128443600792).

Almost surely, 2^256887201583 is an apocalyptic number.

256887201583 is a deficient number, since it is larger than the sum of its proper divisors (1).

256887201583 is an equidigital number, since it uses as much as digits as its factorization.

256887201583 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6451200, while the sum is 55.

The spelling of 256887201583 in words is "two hundred fifty-six billion, eight hundred eighty-seven million, two hundred one thousand, five hundred eighty-three".