666873369 has 24 divisors (see below), whose sum is σ = 989308320. Its totient is φ = 432637632.

The previous prime is 666873367. The next prime is 666873391. The reversal of 666873369 is 963378666.

It is a happy number.

It is not a de Polignac number, because 666873369 - 2¹ = 666873367 is a prime.

It is a super-2 number, since 2×666873369² = 889440180562820322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666873367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106477 + ... + 112565.

It is an arithmetic number, because the mean of its divisors is an integer number (41221180).

Almost surely, 2^666873369 is an apocalyptic number.

It is an amenable number.

666873369 is a deficient number, since it is larger than the sum of its proper divisors (322434951).

666873369 is a wasteful number, since it uses less digits than its factorization.

666873369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6421 (or 6418 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 54.

The square root of 666873369 is about 25823.8914379688. The cubic root of 666873369 is about 873.6707409670.

The spelling of 666873369 in words is "six hundred sixty-six million, eight hundred seventy-three thousand, three hundred sixty-nine".