666921133 has 4 divisors (see below), whose sum is σ = 695917728. Its totient is φ = 637924540.

The previous prime is 666921119. The next prime is 666921139. The reversal of 666921133 is 331129666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666921133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666921092 and 666921101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666921139) 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, 14498263 + ... + 14498308.

It is an arithmetic number, because the mean of its divisors is an integer number (173979432).

Almost surely, 2^666921133 is an apocalyptic number.

It is an amenable number.

666921133 is a deficient number, since it is larger than the sum of its proper divisors (28996595).

666921133 is a wasteful number, since it uses less digits than its factorization.

666921133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28996594.

The product of its digits is 34992, while the sum is 37.

The square root of 666921133 is about 25824.8162239347. The cubic root of 666921133 is about 873.6915990064.

The spelling of 666921133 in words is "six hundred sixty-six million, nine hundred twenty-one thousand, one hundred thirty-three".