666723837 has 16 divisors (see below), whose sum is σ = 980699328. Its totient is φ = 400283520.

The previous prime is 666723821. The next prime is 666723847. The reversal of 666723837 is 738327666.

It is not a de Polignac number, because 666723837 - 2⁴ = 666723821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666723847) 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, 206883 + ... + 210080.

It is an arithmetic number, because the mean of its divisors is an integer number (61293708).

Almost surely, 2^666723837 is an apocalyptic number.

It is an amenable number.

666723837 is a deficient number, since it is larger than the sum of its proper divisors (313975491).

666723837 is a wasteful number, since it uses less digits than its factorization.

666723837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417020.

The product of its digits is 1524096, while the sum is 48.

The square root of 666723837 is about 25820.9960497267. The cubic root of 666723837 is about 873.6054354657.

The spelling of 666723837 in words is "six hundred sixty-six million, seven hundred twenty-three thousand, eight hundred thirty-seven".