663440505 has 32 divisors (see below), whose sum is σ = 1306470144. Its totient is φ = 279956736.

The previous prime is 663440489. The next prime is 663440549. The reversal of 663440505 is 505044366.

It is not a de Polignac number, because 663440505 - 2⁴ = 663440489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241654 + ... + 244383.

It is an arithmetic number, because the mean of its divisors is an integer number (40827192).

Almost surely, 2^663440505 is an apocalyptic number.

663440505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

663440505 is a deficient number, since it is larger than the sum of its proper divisors (643029639).

663440505 is a wasteful number, since it uses less digits than its factorization.

663440505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486065.

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 663440505 is about 25757.3388571102. The cubic root of 663440505 is about 872.1690296190.

The spelling of 663440505 in words is "six hundred sixty-three million, four hundred forty thousand, five hundred five".