666707023 has 4 divisors (see below), whose sum is σ = 667875208. Its totient is φ = 665538840.

The previous prime is 666706993. The next prime is 666707051. The reversal of 666707023 is 320707666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666707023 - 2¹³ = 666698831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666707053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 583236 + ... + 584377.

It is an arithmetic number, because the mean of its divisors is an integer number (166968802).

Almost surely, 2^666707023 is an apocalyptic number.

666707023 is a deficient number, since it is larger than the sum of its proper divisors (1168185).

666707023 is a wasteful number, since it uses less digits than its factorization.

666707023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168184.

The product of its (nonzero) digits is 63504, while the sum is 37.

The square root of 666707023 is about 25820.6704599242. The cubic root of 666707023 is about 873.5980916328.

The spelling of 666707023 in words is "six hundred sixty-six million, seven hundred seven thousand, twenty-three".