256450663 has 18 divisors (see below), whose sum is σ = 306680976. Its totient is φ = 213817968.

The previous prime is 256450643. The next prime is 256450717. The reversal of 256450663 is 366054652.

It is a de Polignac number, because none of the positive numbers 2^k-256450663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256450643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 65170 + ... + 68992.

It is an arithmetic number, because the mean of its divisors is an integer number (17037832).

Almost surely, 2^256450663 is an apocalyptic number.

256450663 is a deficient number, since it is larger than the sum of its proper divisors (50230313).

256450663 is an equidigital number, since it uses as much as digits as its factorization.

256450663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911 (or 3867 counting only the distinct ones).

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

The square root of 256450663 is about 16014.0770261667. The cubic root of 256450663 is about 635.3327976326.

The spelling of 256450663 in words is "two hundred fifty-six million, four hundred fifty thousand, six hundred sixty-three".