663623645 has 16 divisors (see below), whose sum is σ = 843913728. Its totient is φ = 499242240.

The previous prime is 663623633. The next prime is 663623647. The reversal of 663623645 is 546326366.

It is not a de Polignac number, because 663623645 - 2⁴ = 663623629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663623647) 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, 125852 + ... + 131018.

It is an arithmetic number, because the mean of its divisors is an integer number (52744608).

Almost surely, 2^663623645 is an apocalyptic number.

It is an amenable number.

663623645 is a deficient number, since it is larger than the sum of its proper divisors (180290083).

663623645 is a wasteful number, since it uses less digits than its factorization.

663623645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700.

The product of its digits is 466560, while the sum is 41.

The square root of 663623645 is about 25760.8937150868. The cubic root of 663623645 is about 872.2492751168.

It can be divided in two parts, 66362 and 3645, that added together give a palindrome (70007).

The spelling of 663623645 in words is "six hundred sixty-three million, six hundred twenty-three thousand, six hundred forty-five".