663720895 has 4 divisors (see below), whose sum is σ = 796465080. Its totient is φ = 530976712.

The previous prime is 663720859. The next prime is 663720899. The reversal of 663720895 is 598027366.

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 663720895 - 2²⁷ = 529503167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663720899) 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, 66372085 + ... + 66372094.

It is an arithmetic number, because the mean of its divisors is an integer number (199116270).

Almost surely, 2^663720895 is an apocalyptic number.

663720895 is a deficient number, since it is larger than the sum of its proper divisors (132744185).

663720895 is a wasteful number, since it uses less digits than its factorization.

663720895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132744184.

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 663720895 is about 25762.7811969127. The cubic root of 663720895 is about 872.2918806405.

The spelling of 663720895 in words is "six hundred sixty-three million, seven hundred twenty thousand, eight hundred ninety-five".