666401452 has 12 divisors (see below), whose sum is σ = 1167145000. Its totient is φ = 332931456.

The previous prime is 666401441. The next prime is 666401467. The reversal of 666401452 is 254104666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61698 + ... + 71689.

Almost surely, 2^666401452 is an apocalyptic number.

It is an amenable number.

666401452 is a deficient number, since it is larger than the sum of its proper divisors (500743548).

666401452 is a wasteful number, since it uses less digits than its factorization.

666401452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134640 (or 134638 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 666401452 is about 25814.7526038891. The cubic root of 666401452 is about 873.4646061954.

The spelling of 666401452 in words is "six hundred sixty-six million, four hundred one thousand, four hundred fifty-two".