663886405 has 16 divisors (see below), whose sum is σ = 980509824. Its totient is φ = 420217920.

The previous prime is 663886403. The next prime is 663886463. The reversal of 663886405 is 504688366.

It is not a de Polignac number, because 663886405 - 2¹ = 663886403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663886403) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 729091 + ... + 730000.

It is an arithmetic number, because the mean of its divisors is an integer number (61281864).

Almost surely, 2^663886405 is an apocalyptic number.

663886405 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

663886405 is a deficient number, since it is larger than the sum of its proper divisors (316623419).

663886405 is a wasteful number, since it uses less digits than its factorization.

663886405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459116.

The product of its (nonzero) digits is 829440, while the sum is 46.

The square root of 663886405 is about 25765.9931886974. The cubic root of 663886405 is about 872.3643815121.

The spelling of 663886405 in words is "six hundred sixty-three million, eight hundred eighty-six thousand, four hundred five".