253640563 has 12 divisors (see below), whose sum is σ = 284062464. Its totient is φ = 226226000.

The previous prime is 253640507. The next prime is 253640579. The reversal of 253640563 is 365046352.

It is a de Polignac number, because none of the positive numbers 2^k-253640563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253640263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13363 + ... + 26188.

It is an arithmetic number, because the mean of its divisors is an integer number (23671872).

Almost surely, 2^253640563 is an apocalyptic number.

253640563 is a deficient number, since it is larger than the sum of its proper divisors (30421901).

253640563 is a wasteful number, since it uses less digits than its factorization.

253640563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39626 (or 39615 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 34.

The square root of 253640563 is about 15926.0969166962. The cubic root of 253640563 is about 633.0036819697.

The spelling of 253640563 in words is "two hundred fifty-three million, six hundred forty thousand, five hundred sixty-three".