663149209 has 8 divisors (see below), whose sum is σ = 704176200. Its totient is φ = 622346496.

The previous prime is 663149189. The next prime is 663149213. The reversal of 663149209 is 902941366.

It can be written as a sum of positive squares in 4 ways, for example, as 148766809 + 514382400 = 12197^2 + 22680^2 .

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 663149209 - 2¹⁷ = 663018137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663141209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49954 + ... + 61819.

It is an arithmetic number, because the mean of its divisors is an integer number (88022025).

Almost surely, 2^663149209 is an apocalyptic number.

It is an amenable number.

663149209 is a deficient number, since it is larger than the sum of its proper divisors (41026991).

663149209 is a wasteful number, since it uses less digits than its factorization.

663149209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112139.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 663149209 is about 25751.6836148629. The cubic root of 663149209 is about 872.0413635409.

The spelling of 663149209 in words is "six hundred sixty-three million, one hundred forty-nine thousand, two hundred nine".