663243155 has 8 divisors (see below), whose sum is σ = 796122432. Its totient is φ = 530440768.

The previous prime is 663243143. The next prime is 663243193. The reversal of 663243155 is 551342366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 663243155 - 2¹⁴ = 663226771 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1862 + ... + 36468.

It is an arithmetic number, because the mean of its divisors is an integer number (99515304).

Almost surely, 2^663243155 is an apocalyptic number.

663243155 is a deficient number, since it is larger than the sum of its proper divisors (132879277).

663243155 is a wasteful number, since it uses less digits than its factorization.

663243155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38445.

The product of its digits is 64800, while the sum is 35.

The square root of 663243155 is about 25753.5076251760. The cubic root of 663243155 is about 872.0825412671.

The spelling of 663243155 in words is "six hundred sixty-three million, two hundred forty-three thousand, one hundred fifty-five".