251065563 has 24 divisors (see below), whose sum is σ = 409907520. Its totient is φ = 135913680.

The previous prime is 251065543. The next prime is 251065567. The reversal of 251065563 is 365560152.

It is not a de Polignac number, because 251065563 - 2⁵ = 251065531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251065567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42153 + ... + 47738.

It is an arithmetic number, because the mean of its divisors is an integer number (17079480).

Almost surely, 2^251065563 is an apocalyptic number.

251065563 is a deficient number, since it is larger than the sum of its proper divisors (158841957).

251065563 is a wasteful number, since it uses less digits than its factorization.

251065563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89927 (or 89920 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 251065563 is about 15845.0485325858. The cubic root of 251065563 is about 630.8542731900.

The spelling of 251065563 in words is "two hundred fifty-one million, sixty-five thousand, five hundred sixty-three".