666452999 has 4 divisors (see below), whose sum is σ = 677378520. Its totient is φ = 655527480.

The previous prime is 666452977. The next prime is 666453049. The reversal of 666452999 is 999254666.

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

It is a cyclic number.

It is not a de Polignac number, because 666452999 - 2¹² = 666448903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666452299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5462669 + ... + 5462790.

It is an arithmetic number, because the mean of its divisors is an integer number (169344630).

Almost surely, 2^666452999 is an apocalyptic number.

666452999 is a deficient number, since it is larger than the sum of its proper divisors (10925521).

666452999 is a wasteful number, since it uses less digits than its factorization.

666452999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10925520.

The product of its digits is 6298560, while the sum is 56.

The square root of 666452999 is about 25815.7509865586. The cubic root of 666452999 is about 873.4871268142.

The spelling of 666452999 in words is "six hundred sixty-six million, four hundred fifty-two thousand, nine hundred ninety-nine".