663719445 has 24 divisors (see below), whose sum is σ = 1151080632. Its totient is φ = 353788800.

The previous prime is 663719429. The next prime is 663719453. The reversal of 663719445 is 544917366.

663719445 is a `hidden beast` number, since 6 + 637 + 1 + 9 + 4 + 4 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10712529 + 653006916 = 3273^2 + 25554^2 .

It is not a de Polignac number, because 663719445 - 2⁴ = 663719429 is a prime.

It is a super-2 number, since 2×663719445² = 881047003342216050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 663719445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120655 + ... + 126035.

It is an arithmetic number, because the mean of its divisors is an integer number (47961693).

Almost surely, 2^663719445 is an apocalyptic number.

It is an amenable number.

663719445 is a deficient number, since it is larger than the sum of its proper divisors (487361187).

663719445 is a wasteful number, since it uses less digits than its factorization.

663719445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8133 (or 8130 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 663719445 is about 25762.7530555257. The cubic root of 663719445 is about 872.2912454216.

The spelling of 663719445 in words is "six hundred sixty-three million, seven hundred nineteen thousand, four hundred forty-five".