666575774 has 4 divisors (see below), whose sum is σ = 999863664. Its totient is φ = 333287886.

The previous prime is 666575771. The next prime is 666575779. The reversal of 666575774 is 477575666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666575771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166643942 + ... + 166643945.

It is an arithmetic number, because the mean of its divisors is an integer number (249965916).

Almost surely, 2^666575774 is an apocalyptic number.

666575774 is a deficient number, since it is larger than the sum of its proper divisors (333287890).

666575774 is a wasteful number, since it uses less digits than its factorization.

666575774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333287889.

The product of its digits is 7408800, while the sum is 53.

The square root of 666575774 is about 25818.1287857970. The cubic root of 666575774 is about 873.5407619029.

The spelling of 666575774 in words is "six hundred sixty-six million, five hundred seventy-five thousand, seven hundred seventy-four".