663243156 has 18 divisors (see below), whose sum is σ = 1676531402. Its totient is φ = 221081040.

The previous prime is 663243143. The next prime is 663243193. The reversal of 663243156 is 651342366.

663243156 is a `hidden beast` number, since 6 + 632 + 4 + 3 + 15 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 662547600 + 695556 = 25740^2 + 834^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 18423421 = 663243156 / (6 + 6 + 3 + 2 + 4 + 3 + 1 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 663243156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9211675 + ... + 9211746.

Almost surely, 2^663243156 is an apocalyptic number.

It is an amenable number.

663243156 is an abundant number, since it is smaller than the sum of its proper divisors (1013288246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663243156 is a wasteful number, since it uses less digits than its factorization.

663243156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18423431 (or 18423426 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 663243156 is about 25753.5076445909. The cubic root of 663243156 is about 872.0825417054.

The spelling of 663243156 in words is "six hundred sixty-three million, two hundred forty-three thousand, one hundred fifty-six".