663345651 has 8 divisors (see below), whose sum is σ = 931011520. Its totient is φ = 418955112.

The previous prime is 663345637. The next prime is 663345707. The reversal of 663345651 is 156543366.

It is a happy number.

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

It is not a de Polignac number, because 663345651 - 2⁵ = 663345619 is a prime.

It is a super-2 number, since 2×663345651² = 880054905401227602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663345251) 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, 5818765 + ... + 5818878.

It is an arithmetic number, because the mean of its divisors is an integer number (116376440).

Almost surely, 2^663345651 is an apocalyptic number.

663345651 is a deficient number, since it is larger than the sum of its proper divisors (267665869).

663345651 is a wasteful number, since it uses less digits than its factorization.

663345651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11637665.

The product of its digits is 194400, while the sum is 39.

The square root of 663345651 is about 25755.4974908271. The cubic root of 663345651 is about 872.1274621318.

The spelling of 663345651 in words is "six hundred sixty-three million, three hundred forty-five thousand, six hundred fifty-one".