663769645 has 32 divisors (see below), whose sum is σ = 994625280. Its totient is φ = 413130240.

The previous prime is 663769637. The next prime is 663769663. The reversal of 663769645 is 546967366.

It is not a de Polignac number, because 663769645 - 2³ = 663769637 is a prime.

It is a super-3 number, since 3×663769645³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 663769592 and 663769601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396871 + ... + 398539.

It is an arithmetic number, because the mean of its divisors is an integer number (31082040).

Almost surely, 2^663769645 is an apocalyptic number.

It is an amenable number.

663769645 is a deficient number, since it is larger than the sum of its proper divisors (330855635).

663769645 is a wasteful number, since it uses less digits than its factorization.

663769645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2725.

The product of its digits is 4898880, while the sum is 52.

The square root of 663769645 is about 25763.7273118623. The cubic root of 663769645 is about 872.3132365992.

The spelling of 663769645 in words is "six hundred sixty-three million, seven hundred sixty-nine thousand, six hundred forty-five".