666253673 has 4 divisors (see below), whose sum is σ = 695221248. Its totient is φ = 637286100.

The previous prime is 666253669. The next prime is 666253697. The reversal of 666253673 is 376352666.

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 666253673 - 2² = 666253669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666253603) 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, 14483753 + ... + 14483798.

It is an arithmetic number, because the mean of its divisors is an integer number (173805312).

Almost surely, 2^666253673 is an apocalyptic number.

It is an amenable number.

666253673 is a deficient number, since it is larger than the sum of its proper divisors (28967575).

666253673 is a wasteful number, since it uses less digits than its factorization.

666253673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28967574.

The product of its digits is 816480, while the sum is 44.

The square root of 666253673 is about 25811.8901477594. The cubic root of 666253673 is about 873.4000358735.

The spelling of 666253673 in words is "six hundred sixty-six million, two hundred fifty-three thousand, six hundred seventy-three".