666677423 has 4 divisors (see below), whose sum is σ = 705893760. Its totient is φ = 627461088.

The previous prime is 666677419. The next prime is 666677437. The reversal of 666677423 is 324776666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324776666 = 2 ⋅162388333.

It is a cyclic number.

It is not a de Polignac number, because 666677423 - 2² = 666677419 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 (666677443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19608143 + ... + 19608176.

It is an arithmetic number, because the mean of its divisors is an integer number (176473440).

Almost surely, 2^666677423 is an apocalyptic number.

666677423 is a deficient number, since it is larger than the sum of its proper divisors (39216337).

666677423 is a wasteful number, since it uses less digits than its factorization.

666677423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39216336.

The product of its digits is 1524096, while the sum is 47.

The square root of 666677423 is about 25820.0972693753. The cubic root of 666677423 is about 873.5851629724.

The spelling of 666677423 in words is "six hundred sixty-six million, six hundred seventy-seven thousand, four hundred twenty-three".