663666413 has 8 divisors (see below), whose sum is σ = 670524000. Its totient is φ = 656841168.

The previous prime is 663666407. The next prime is 663666431. The reversal of 663666413 is 314666366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 663666413 - 2¹⁰ = 663665389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663666463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34298 + ... + 50036.

It is an arithmetic number, because the mean of its divisors is an integer number (83815500).

Almost surely, 2^663666413 is an apocalyptic number.

It is an amenable number.

663666413 is a deficient number, since it is larger than the sum of its proper divisors (6857587).

663666413 is a wasteful number, since it uses less digits than its factorization.

663666413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16171.

The product of its digits is 279936, while the sum is 41.

The square root of 663666413 is about 25761.7237971375. The cubic root of 663666413 is about 872.2680124217.

The spelling of 663666413 in words is "six hundred sixty-three million, six hundred sixty-six thousand, four hundred thirteen".