663661445 has 16 divisors (see below), whose sum is σ = 805559040. Its totient is φ = 524838144.

The previous prime is 663661429. The next prime is 663661447. The reversal of 663661445 is 544166366.

It is a cyclic number.

It is not a de Polignac number, because 663661445 - 2⁴ = 663661429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663661447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502496 + ... + 503814.

It is an arithmetic number, because the mean of its divisors is an integer number (50347440).

Almost surely, 2^663661445 is an apocalyptic number.

It is an amenable number.

663661445 is a deficient number, since it is larger than the sum of its proper divisors (141897595).

663661445 is a wasteful number, since it uses less digits than its factorization.

663661445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404.

The product of its digits is 311040, while the sum is 41.

The square root of 663661445 is about 25761.6273748379. The cubic root of 663661445 is about 872.2658359074.

The spelling of 663661445 in words is "six hundred sixty-three million, six hundred sixty-one thousand, four hundred forty-five".