663505479 has 128 divisors (see below), whose sum is σ = 1299916800. Its totient is φ = 324725760.

The previous prime is 663505477. The next prime is 663505487. The reversal of 663505479 is 974505366.

663505479 is a `hidden beast` number, since 6 + 635 + 0 + 5 + 4 + 7 + 9 = 666.

It is not a de Polignac number, because 663505479 - 2¹ = 663505477 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663505477) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2847547 + ... + 2847779.

It is an arithmetic number, because the mean of its divisors is an integer number (10155600).

Almost surely, 2^663505479 is an apocalyptic number.

663505479 is a deficient number, since it is larger than the sum of its proper divisors (636411321).

663505479 is a wasteful number, since it uses less digits than its factorization.

663505479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 45.

The square root of 663505479 is about 25758.6000978314. The cubic root of 663505479 is about 872.1975006274.

The spelling of 663505479 in words is "six hundred sixty-three million, five hundred five thousand, four hundred seventy-nine".