666874723 has 2 divisors, whose sum is σ = 666874724. Its totient is φ = 666874722.

The previous prime is 666874687. The next prime is 666874777. The reversal of 666874723 is 327478666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666874723 - 2²⁵ = 633320291 is a prime.

It is not a weakly prime, because it can be changed into another prime (666874123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333437361 + 333437362.

It is an arithmetic number, because the mean of its divisors is an integer number (333437362).

Almost surely, 2^666874723 is an apocalyptic number.

666874723 is a deficient number, since it is larger than the sum of its proper divisors (1).

666874723 is an equidigital number, since it uses as much as digits as its factorization.

666874723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 49.

The square root of 666874723 is about 25823.9176539889. The cubic root of 666874723 is about 873.6713322584.

The spelling of 666874723 in words is "six hundred sixty-six million, eight hundred seventy-four thousand, seven hundred twenty-three".