666654867 has 20 divisors (see below), whose sum is σ = 998351640. Its totient is φ = 443327904.

The previous prime is 666654827. The next prime is 666654869. The reversal of 666654867 is 768456666.

It is not a de Polignac number, because 666654867 - 2¹⁰ = 666653843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666654869) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23068 + ... + 43190.

It is an arithmetic number, because the mean of its divisors is an integer number (49917582).

Almost surely, 2^666654867 is an apocalyptic number.

666654867 is a deficient number, since it is larger than the sum of its proper divisors (331696773).

666654867 is a wasteful number, since it uses less digits than its factorization.

666654867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20544 (or 20535 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The square root of 666654867 is about 25819.6604741426. The cubic root of 666654867 is about 873.5753107267.

The spelling of 666654867 in words is "six hundred sixty-six million, six hundred fifty-four thousand, eight hundred sixty-seven".