666673319 has 16 divisors (see below), whose sum is σ = 725596704. Its totient is φ = 608880000.

The previous prime is 666673297. The next prime is 666673361. The reversal of 666673319 is 913376666.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 666673319 - 2²⁸ = 398237863 is a prime.

It is a super-2 number, since 2×666673319² = 888906628532951522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666673369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 563909 + ... + 565089.

It is an arithmetic number, because the mean of its divisors is an integer number (45349794).

Almost surely, 2^666673319 is an apocalyptic number.

666673319 is a deficient number, since it is larger than the sum of its proper divisors (58923385).

666673319 is a wasteful number, since it uses less digits than its factorization.

666673319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618.

The product of its digits is 734832, while the sum is 47.

The square root of 666673319 is about 25820.0177962758. The cubic root of 666673319 is about 873.5833704009.

The spelling of 666673319 in words is "six hundred sixty-six million, six hundred seventy-three thousand, three hundred nineteen".