663666367 has 16 divisors (see below), whose sum is σ = 834204672. Its totient is φ = 513923040.

The previous prime is 663666361. The next prime is 663666407. The reversal of 663666367 is 763666366.

It is a cyclic number.

It is not a de Polignac number, because 663666367 - 2³ = 663666359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 663666367.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663666361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73309 + ... + 81862.

It is an arithmetic number, because the mean of its divisors is an integer number (52137792).

Almost surely, 2^663666367 is an apocalyptic number.

663666367 is a deficient number, since it is larger than the sum of its proper divisors (170538305).

663666367 is a wasteful number, since it uses less digits than its factorization.

663666367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155238.

The product of its digits is 2939328, while the sum is 49.

The square root of 663666367 is about 25761.7229043401. The cubic root of 663666367 is about 872.2679922688.

Subtracting 663666367 from its reverse (763666366), we obtain a palindrome (99999999).

The spelling of 663666367 in words is "six hundred sixty-three million, six hundred sixty-six thousand, three hundred sixty-seven".