256045663 has 4 divisors (see below), whose sum is σ = 260385480. Its totient is φ = 251705848.

The previous prime is 256045651. The next prime is 256045681. The reversal of 256045663 is 366540652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256045663 - 2²¹ = 253948511 is a prime.

It is a super-2 number, since 2×256045663² = 131118763082219138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256045063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2169820 + ... + 2169937.

It is an arithmetic number, because the mean of its divisors is an integer number (65096370).

Almost surely, 2^256045663 is an apocalyptic number.

256045663 is a deficient number, since it is larger than the sum of its proper divisors (4339817).

256045663 is an equidigital number, since it uses as much as digits as its factorization.

256045663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4339816.

The product of its (nonzero) digits is 129600, while the sum is 37.

The square root of 256045663 is about 16001.4269051232. The cubic root of 256045663 is about 634.9981714044.

The spelling of 256045663 in words is "two hundred fifty-six million, forty-five thousand, six hundred sixty-three".