256402405563 has 16 divisors (see below), whose sum is σ = 350632060416. Its totient is φ = 166572292320.

The previous prime is 256402405543. The next prime is 256402405573. The reversal of 256402405563 is 365504204652.

It is not a de Polignac number, because 256402405563 - 2¹⁶ = 256402340027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256402405513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2250220 + ... + 2361417.

It is an arithmetic number, because the mean of its divisors is an integer number (21914503776).

Almost surely, 2^256402405563 is an apocalyptic number.

256402405563 is a deficient number, since it is larger than the sum of its proper divisors (94229654853).

256402405563 is a wasteful number, since it uses less digits than its factorization.

256402405563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4612114.

The product of its (nonzero) digits is 864000, while the sum is 42.

The spelling of 256402405563 in words is "two hundred fifty-six billion, four hundred two million, four hundred five thousand, five hundred sixty-three".