666042723 has 16 divisors (see below), whose sum is σ = 987177600. Its totient is φ = 443827080.

The previous prime is 666042721. The next prime is 666042757. The reversal of 666042723 is 327240666.

It is a happy number.

It is not a de Polignac number, because 666042723 - 2¹ = 666042721 is a prime.

It is a super-2 number, since 2×666042723² = 887225817722509458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666042721) 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, 77428 + ... + 85598.

It is an arithmetic number, because the mean of its divisors is an integer number (61698600).

Almost surely, 2^666042723 is an apocalyptic number.

666042723 is a deficient number, since it is larger than the sum of its proper divisors (321134877).

666042723 is a wasteful number, since it uses less digits than its factorization.

666042723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11199 (or 11193 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 666042723 is about 25807.8035291654. The cubic root of 666042723 is about 873.3078471705.

The spelling of 666042723 in words is "six hundred sixty-six million, forty-two thousand, seven hundred twenty-three".