666674405 has 4 divisors (see below), whose sum is σ = 800009292. Its totient is φ = 533339520.

The previous prime is 666674387. The next prime is 666674423. The reversal of 666674405 is 504476666.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (666674387) and next prime (666674423).

It can be written as a sum of positive squares in 2 ways, for example, as 120143521 + 546530884 = 10961^2 + 23378^2 .

It is not a de Polignac number, because 666674405 - 2⁶ = 666674341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 66667436 + ... + 66667445.

It is an arithmetic number, because the mean of its divisors is an integer number (200002323).

Almost surely, 2^666674405 is an apocalyptic number.

It is an amenable number.

666674405 is a deficient number, since it is larger than the sum of its proper divisors (133334887).

666674405 is a wasteful number, since it uses less digits than its factorization.

666674405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133334886.

The product of its (nonzero) digits is 725760, while the sum is 44.

The square root of 666674405 is about 25820.0388264619. The cubic root of 666674405 is about 873.5838447516.

The spelling of 666674405 in words is "six hundred sixty-six million, six hundred seventy-four thousand, four hundred five".