666723877 has 4 divisors (see below), whose sum is σ = 666846880. Its totient is φ = 666600876.

The previous prime is 666723859. The next prime is 666723881. The reversal of 666723877 is 778327666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666723877 - 2¹¹ = 666721829 is a prime.

It is a super-2 number, since 2×666723877² = 889041456323822258, which contains 22 as substring.

It is a Duffinian number.

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 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, 52977 + ... + 64342.

It is an arithmetic number, because the mean of its divisors is an integer number (166711720).

Almost surely, 2^666723877 is an apocalyptic number.

It is an amenable number.

666723877 is a deficient number, since it is larger than the sum of its proper divisors (123003).

666723877 is a wasteful number, since it uses less digits than its factorization.

666723877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123002.

The product of its digits is 3556224, while the sum is 52.

The square root of 666723877 is about 25820.9968242901. The cubic root of 666723877 is about 873.6054529363.

The spelling of 666723877 in words is "six hundred sixty-six million, seven hundred twenty-three thousand, eight hundred seventy-seven".