664563386 has 4 divisors (see below), whose sum is σ = 996845082. Its totient is φ = 332281692.

The previous prime is 664563379. The next prime is 664563421. The reversal of 664563386 is 683365466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 551545225 + 113018161 = 23485^2 + 10631^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 664563386.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166140845 + ... + 166140848.

Almost surely, 2^664563386 is an apocalyptic number.

664563386 is a deficient number, since it is larger than the sum of its proper divisors (332281696).

664563386 is a wasteful number, since it uses less digits than its factorization.

664563386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332281695.

The product of its digits is 1866240, while the sum is 47.

The square root of 664563386 is about 25779.1269440996. The cubic root of 664563386 is about 872.6608044542.

The spelling of 664563386 in words is "six hundred sixty-four million, five hundred sixty-three thousand, three hundred eighty-six".