663431645 has 32 divisors (see below), whose sum is σ = 866436480. Its totient is φ = 485948160.

The previous prime is 663431633. The next prime is 663431663. The reversal of 663431645 is 546134366.

It is not a de Polignac number, because 663431645 - 2¹⁴ = 663415261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 663431599 and 663431608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 607550 + ... + 608640.

It is an arithmetic number, because the mean of its divisors is an integer number (27076140).

Almost surely, 2^663431645 is an apocalyptic number.

It is an amenable number.

663431645 is a deficient number, since it is larger than the sum of its proper divisors (203004835).

663431645 is a wasteful number, since it uses less digits than its factorization.

663431645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325.

The product of its digits is 155520, while the sum is 38.

The square root of 663431645 is about 25757.1668667189. The cubic root of 663431645 is about 872.1651471046.

The spelling of 663431645 in words is "six hundred sixty-three million, four hundred thirty-one thousand, six hundred forty-five".