663511407 has 24 divisors (see below), whose sum is σ = 1008403200. Its totient is φ = 386818848.

The previous prime is 663511397. The next prime is 663511427. The reversal of 663511407 is 704115366.

It is not a de Polignac number, because 663511407 - 2¹⁹ = 662987119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663511427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24807 + ... + 44072.

It is an arithmetic number, because the mean of its divisors is an integer number (42016800).

Almost surely, 2^663511407 is an apocalyptic number.

663511407 is a deficient number, since it is larger than the sum of its proper divisors (344891793).

663511407 is a wasteful number, since it uses less digits than its factorization.

663511407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68927 (or 68914 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 663511407 is about 25758.7151659395. The cubic root of 663511407 is about 872.2000981299.

The spelling of 663511407 in words is "six hundred sixty-three million, five hundred eleven thousand, four hundred seven".