663623375 has 16 divisors (see below), whose sum is σ = 828921600. Its totient is φ = 530437600.

The previous prime is 663623351. The next prime is 663623383. The reversal of 663623375 is 573326366.

It is not a de Polignac number, because 663623375 - 2¹⁴ = 663606991 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 275426 + ... + 277824.

It is an arithmetic number, because the mean of its divisors is an integer number (51807600).

Almost surely, 2^663623375 is an apocalyptic number.

663623375 is a deficient number, since it is larger than the sum of its proper divisors (165298225).

663623375 is a wasteful number, since it uses less digits than its factorization.

663623375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4627 (or 4617 counting only the distinct ones).

The product of its digits is 408240, while the sum is 41.

The square root of 663623375 is about 25760.8884745849. Note that the first 3 decimals coincide. The cubic root of 663623375 is about 872.2491568232.

The spelling of 663623375 in words is "six hundred sixty-three million, six hundred twenty-three thousand, three hundred seventy-five".