663385777 has 8 divisors (see below), whose sum is σ = 678335616. Its totient is φ = 648470832.

The previous prime is 663385763. The next prime is 663385783. The reversal of 663385777 is 777583366.

It is a happy number.

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 663385777 - 2⁷ = 663385649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663380777) 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, 31818 + ... + 48364.

It is an arithmetic number, because the mean of its divisors is an integer number (84791952).

Almost surely, 2^663385777 is an apocalyptic number.

It is an amenable number.

663385777 is a deficient number, since it is larger than the sum of its proper divisors (14949839).

663385777 is a wasteful number, since it uses less digits than its factorization.

663385777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17447.

The product of its digits is 4445280, while the sum is 52.

The square root of 663385777 is about 25756.2764583703. The cubic root of 663385777 is about 872.1450468710.

The spelling of 663385777 in words is "six hundred sixty-three million, three hundred eighty-five thousand, seven hundred seventy-seven".