663557945 has 8 divisors (see below), whose sum is σ = 821955840. Its totient is φ = 513722160.

The previous prime is 663557911. The next prime is 663557959. The reversal of 663557945 is 549755366.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 663557945 - 2¹⁶ = 663492409 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 663557893 and 663557902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2140355 + ... + 2140664.

It is an arithmetic number, because the mean of its divisors is an integer number (102744480).

Almost surely, 2^663557945 is an apocalyptic number.

It is an amenable number.

663557945 is a deficient number, since it is larger than the sum of its proper divisors (158397895).

663557945 is a wasteful number, since it uses less digits than its factorization.

663557945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4281055.

The product of its digits is 3402000, while the sum is 50.

The square root of 663557945 is about 25759.6184948458. The cubic root of 663557945 is about 872.2204893891.

The spelling of 663557945 in words is "six hundred sixty-three million, five hundred fifty-seven thousand, nine hundred forty-five".