663667375 has 64 divisors (see below), whose sum is σ = 1001594880. Its totient is φ = 429408000.

The previous prime is 663667351. The next prime is 663667399. The reversal of 663667375 is 573766366.

It is an interprime number because it is at equal distance from previous prime (663667351) and next prime (663667399).

It is not a de Polignac number, because 663667375 - 2¹⁵ = 663634607 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1166091 + ... + 1166659.

It is an arithmetic number, because the mean of its divisors is an integer number (15649920).

Almost surely, 2^663667375 is an apocalyptic number.

663667375 is a deficient number, since it is larger than the sum of its proper divisors (337927505).

663667375 is a wasteful number, since it uses less digits than its factorization.

663667375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 655 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 49.

The square root of 663667375 is about 25761.7424682415. The cubic root of 663667375 is about 872.2684338791.

The spelling of 663667375 in words is "six hundred sixty-three million, six hundred sixty-seven thousand, three hundred seventy-five".