153661563 has 32 divisors (see below), whose sum is σ = 254419200. Its totient is φ = 90849600.

The previous prime is 153661549. The next prime is 153661603. The reversal of 153661563 is 365166351.

153661563 is a `hidden beast` number, since 1 + 5 + 36 + 61 + 563 = 666.

It is not a de Polignac number, because 153661563 - 2⁹ = 153661051 is a prime.

It is a super-2 number, since 2×153661563² = 47223751887205938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (153661063) 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 31 ways as a sum of consecutive naturals, for example, 5868 + ... + 18486.

It is an arithmetic number, because the mean of its divisors is an integer number (7950600).

Almost surely, 2^153661563 is an apocalyptic number.

153661563 is a deficient number, since it is larger than the sum of its proper divisors (100757637).

153661563 is a wasteful number, since it uses less digits than its factorization.

153661563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12680 (or 12674 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 153661563 is about 12396.0301306507. The cubic root of 153661563 is about 535.6178996421.

The spelling of 153661563 in words is "one hundred fifty-three million, six hundred sixty-one thousand, five hundred sixty-three".