663561456 has 40 divisors (see below), whose sum is σ = 1738353024. Its totient is φ = 218070720.

The previous prime is 663561449. The next prime is 663561461. The reversal of 663561456 is 654165366.

It is a congruent number.

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, 93946 + ... + 100761.

Almost surely, 2^663561456 is an apocalyptic number.

It is an amenable number.

663561456 is an abundant number, since it is smaller than the sum of its proper divisors (1074791568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663561456 is a wasteful number, since it uses less digits than its factorization.

663561456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194789 (or 194783 counting only the distinct ones).

The product of its digits is 388800, while the sum is 42.

The square root of 663561456 is about 25759.6866440568. The cubic root of 663561456 is about 872.2220277429. Note that the first 3 decimals are identical.

The spelling of 663561456 in words is "six hundred sixty-three million, five hundred sixty-one thousand, four hundred fifty-six".