666948723 has 16 divisors (see below), whose sum is σ = 1019928576. Its totient is φ = 379753920.

The previous prime is 666948721. The next prime is 666948761. The reversal of 666948723 is 327849666.

It is a happy number.

666948723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666948723 - 2¹ = 666948721 is a prime.

It is a super-2 number, since 2×666948723² = 889641198222661458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666948721) 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, 50611 + ... + 62412.

It is an arithmetic number, because the mean of its divisors is an integer number (63745536).

Almost surely, 2^666948723 is an apocalyptic number.

666948723 is a deficient number, since it is larger than the sum of its proper divisors (352979853).

666948723 is a wasteful number, since it uses less digits than its factorization.

666948723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113314.

The product of its digits is 2612736, while the sum is 51.

The square root of 666948723 is about 25825.3503945251. The cubic root of 666948723 is about 873.7036468172.

The spelling of 666948723 in words is "six hundred sixty-six million, nine hundred forty-eight thousand, seven hundred twenty-three".