663569954 has 4 divisors (see below), whose sum is σ = 995354934. Its totient is φ = 331784976.

The previous prime is 663569947. The next prime is 663569971. The reversal of 663569954 is 459965366.

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

It can be written as a sum of positive squares in only one way, i.e., 362026729 + 301543225 = 19027^2 + 17365^2 .

It is a junction number, because it is equal to n+sod(n) for n = 663569896 and 663569905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165892487 + ... + 165892490.

Almost surely, 2^663569954 is an apocalyptic number.

663569954 is a deficient number, since it is larger than the sum of its proper divisors (331784980).

663569954 is a wasteful number, since it uses less digits than its factorization.

663569954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331784979.

The product of its digits is 5248800, while the sum is 53.

The square root of 663569954 is about 25759.8515911874. The cubic root of 663569954 is about 872.2257511414.

The spelling of 663569954 in words is "six hundred sixty-three million, five hundred sixty-nine thousand, nine hundred fifty-four".