667419971 has 8 divisors (see below), whose sum is σ = 684591600. Its totient is φ = 650449440.

The previous prime is 667419959. The next prime is 667420001. The reversal of 667419971 is 179914766.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667419971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667419901) 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, 43541 + ... + 56838.

It is an arithmetic number, because the mean of its divisors is an integer number (85573950).

Almost surely, 2^667419971 is an apocalyptic number.

667419971 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

667419971 is a deficient number, since it is larger than the sum of its proper divisors (17171629).

667419971 is a wasteful number, since it uses less digits than its factorization.

667419971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100549.

The product of its digits is 571536, while the sum is 50.

The square root of 667419971 is about 25834.4725318711. The cubic root of 667419971 is about 873.9093768567.

The spelling of 667419971 in words is "six hundred sixty-seven million, four hundred nineteen thousand, nine hundred seventy-one".