663021616 has 20 divisors (see below), whose sum is σ = 1285962832. Its totient is φ = 331160256.

The previous prime is 663021589. The next prime is 663021617. The reversal of 663021616 is 616120366.

It is not an unprimeable number, because it can be changed into a prime (663021617) 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, 5955 + ... + 36898.

Almost surely, 2^663021616 is an apocalyptic number.

It is an amenable number.

663021616 is a deficient number, since it is larger than the sum of its proper divisors (622941216).

663021616 is a wasteful number, since it uses less digits than its factorization.

663021616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43828 (or 43822 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 663021616 is about 25749.2061236847. The cubic root of 663021616 is about 871.9854316787.

The spelling of 663021616 in words is "six hundred sixty-three million, twenty-one thousand, six hundred sixteen".