663645436 has 12 divisors (see below), whose sum is σ = 1183292712. Its totient is φ = 325561808.

The previous prime is 663645419. The next prime is 663645457. The reversal of 663645436 is 634546366.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 663645392 and 663645401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1564990 + ... + 1565413.

It is an arithmetic number, because the mean of its divisors is an integer number (98607726).

Almost surely, 2^663645436 is an apocalyptic number.

It is an amenable number.

663645436 is a deficient number, since it is larger than the sum of its proper divisors (519647276).

663645436 is a wasteful number, since it uses less digits than its factorization.

663645436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3130460 (or 3130458 counting only the distinct ones).

The product of its digits is 933120, while the sum is 43.

The square root of 663645436 is about 25761.3166588977. The cubic root of 663645436 is about 872.2588221827.

The spelling of 663645436 in words is "six hundred sixty-three million, six hundred forty-five thousand, four hundred thirty-six".