663645974 has 4 divisors (see below), whose sum is σ = 995468964. Its totient is φ = 331822986.

The previous prime is 663645971. The next prime is 663645977. The reversal of 663645974 is 479546366.

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

It is an interprime number because it is at equal distance from previous prime (663645971) and next prime (663645977).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663645971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165911492 + ... + 165911495.

It is an arithmetic number, because the mean of its divisors is an integer number (248867241).

Almost surely, 2^663645974 is an apocalyptic number.

663645974 is a deficient number, since it is larger than the sum of its proper divisors (331822990).

663645974 is a wasteful number, since it uses less digits than its factorization.

663645974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331822989.

The product of its digits is 3265920, while the sum is 50.

The square root of 663645974 is about 25761.3271009084. The cubic root of 663645974 is about 872.2590578884.

The spelling of 663645974 in words is "six hundred sixty-three million, six hundred forty-five thousand, nine hundred seventy-four".