666674439 has 16 divisors (see below), whose sum is σ = 906799104. Its totient is φ = 435520800.

The previous prime is 666674423. The next prime is 666674447. The reversal of 666674439 is 934476666.

It is not a de Polignac number, because 666674439 - 2⁴ = 666674423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666674391 and 666674400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666674039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155454 + ... + 159684.

It is an arithmetic number, because the mean of its divisors is an integer number (56674944).

Almost surely, 2^666674439 is an apocalyptic number.

666674439 is a deficient number, since it is larger than the sum of its proper divisors (240124665).

666674439 is a wasteful number, since it uses less digits than its factorization.

666674439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278.

The product of its digits is 3919104, while the sum is 51.

The square root of 666674439 is about 25820.0394848652. The cubic root of 666674439 is about 873.5838596024.

The spelling of 666674439 in words is "six hundred sixty-six million, six hundred seventy-four thousand, four hundred thirty-nine".