666314021 has 8 divisors (see below), whose sum is σ = 701848800. Its totient is φ = 630825840.

The previous prime is 666314003. The next prime is 666314113. The reversal of 666314021 is 120413666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-666314021 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 (666314221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19931 + ... + 41591.

It is an arithmetic number, because the mean of its divisors is an integer number (87731100).

Almost surely, 2^666314021 is an apocalyptic number.

It is an amenable number.

666314021 is a deficient number, since it is larger than the sum of its proper divisors (35534779).

666314021 is a wasteful number, since it uses less digits than its factorization.

666314021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23299.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 666314021 is about 25813.0591174312. The cubic root of 666314021 is about 873.4264053862.

Adding to 666314021 its reverse (120413666), we get a palindrome (786727687).

The spelling of 666314021 in words is "six hundred sixty-six million, three hundred fourteen thousand, twenty-one".