663640202 has 4 divisors (see below), whose sum is σ = 995460306. Its totient is φ = 331820100.

The previous prime is 663640181. The next prime is 663640213. The reversal of 663640202 is 202046366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 432265681 + 231374521 = 20791^2 + 15211^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165910049 + ... + 165910052.

Almost surely, 2^663640202 is an apocalyptic number.

663640202 is a deficient number, since it is larger than the sum of its proper divisors (331820104).

663640202 is a wasteful number, since it uses less digits than its factorization.

663640202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331820103.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 663640202 is about 25761.2150722748. The cubic root of 663640202 is about 872.2565290834.

Adding to 663640202 its reverse (202046366), we get a palindrome (865686568).

The spelling of 663640202 in words is "six hundred sixty-three million, six hundred forty thousand, two hundred two".