663690197 has 12 divisors (see below), whose sum is σ = 704819520. Its totient is φ = 624846312.

The previous prime is 663690151. The next prime is 663690229. The reversal of 663690197 is 791096366.

It is a happy number.

It is not a de Polignac number, because 663690197 - 2⁶ = 663690133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663690397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53204 + ... + 64482.

It is an arithmetic number, because the mean of its divisors is an integer number (58734960).

Almost surely, 2^663690197 is an apocalyptic number.

It is an amenable number.

663690197 is a deficient number, since it is larger than the sum of its proper divisors (41129323).

663690197 is a wasteful number, since it uses less digits than its factorization.

663690197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11480 (or 11461 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 663690197 is about 25762.1854080744. The cubic root of 663690197 is about 872.2784322020.

The spelling of 663690197 in words is "six hundred sixty-three million, six hundred ninety thousand, one hundred ninety-seven".