666392747 has 4 divisors (see below), whose sum is σ = 670806096. Its totient is φ = 661979400.

The previous prime is 666392689. The next prime is 666392759. The reversal of 666392747 is 747293666.

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 666392747 - 2¹⁰ = 666391723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666392695 and 666392704.

It is not an unprimeable number, because it can be changed into a prime (666392767) 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, 2206448 + ... + 2206749.

It is an arithmetic number, because the mean of its divisors is an integer number (167701524).

Almost surely, 2^666392747 is an apocalyptic number.

666392747 is a deficient number, since it is larger than the sum of its proper divisors (4413349).

666392747 is a wasteful number, since it uses less digits than its factorization.

666392747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4413348.

The product of its digits is 2286144, while the sum is 50.

The square root of 666392747 is about 25814.5839981976. The cubic root of 666392747 is about 873.4608029111.

The spelling of 666392747 in words is "six hundred sixty-six million, three hundred ninety-two thousand, seven hundred forty-seven".