667174021 has 8 divisors (see below), whose sum is σ = 672235200. Its totient is φ = 662121600.

The previous prime is 667173989. The next prime is 667174031. The reversal of 667174021 is 120471766.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 667174021 - 2⁵ = 667173989 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 (667174031) 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, 284070 + ... + 286408.

It is an arithmetic number, because the mean of its divisors is an integer number (84029400).

Almost surely, 2^667174021 is an apocalyptic number.

It is an amenable number.

667174021 is a deficient number, since it is larger than the sum of its proper divisors (5061179).

667174021 is a wasteful number, since it uses less digits than its factorization.

667174021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 667174021 is about 25829.7119805855. The cubic root of 667174021 is about 873.8020159605.

The spelling of 667174021 in words is "six hundred sixty-seven million, one hundred seventy-four thousand, twenty-one".