663474564 has 99 divisors (see below), whose sum is σ = 1775091493. Its totient is φ = 216985392.

The previous prime is 663474523. The next prime is 663474577. The reversal of 663474564 is 465474366.

It is a happy number.

The square root of 663474564 is 25758.

It is a perfect power (a square), and thus also a powerful number.

663474564 is a `hidden beast` number, since 6 + 634 + 7 + 4 + 5 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 478296900 + 185177664 = 21870^2 + 13608^2 .

It is a Duffinian number.

Its product of digits (1451520) is a multiple of the sum of its prime factors (140).

It is an unprimeable number.

It is a polite number, since it can be written in 32 ways as a sum of consecutive naturals, for example, 12518362 + ... + 12518414.

Almost surely, 2^663474564 is an apocalyptic number.

663474564 is the 25758-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663474564

663474564 is an abundant number, since it is smaller than the sum of its proper divisors (1111616929).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663474564 is an frugal number, since it uses more digits than its factorization.

663474564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 58 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 45.

The cubic root of 663474564 is about 872.1839541909.

The spelling of 663474564 in words is "six hundred sixty-three million, four hundred seventy-four thousand, five hundred sixty-four".