663664351 has 4 divisors (see below), whose sum is σ = 758473552. Its totient is φ = 568855152.

The previous prime is 663664349. The next prime is 663664361. The reversal of 663664351 is 153466366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 663664351 - 2¹ = 663664349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663664321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47404590 + ... + 47404603.

It is an arithmetic number, because the mean of its divisors is an integer number (189618388).

Almost surely, 2^663664351 is an apocalyptic number.

663664351 is a deficient number, since it is larger than the sum of its proper divisors (94809201).

663664351 is an equidigital number, since it uses as much as digits as its factorization.

663664351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94809200.

The product of its digits is 233280, while the sum is 40.

The square root of 663664351 is about 25761.6837764926. The cubic root of 663664351 is about 872.2671090469.

The spelling of 663664351 in words is "six hundred sixty-three million, six hundred sixty-four thousand, three hundred fifty-one".