666775742 has 16 divisors (see below), whose sum is σ = 1027879632. Its totient is φ = 324161280.

The previous prime is 666775741. The next prime is 666775757. The reversal of 666775742 is 247577666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666775741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217742 + ... + 220782.

It is an arithmetic number, because the mean of its divisors is an integer number (64242477).

Almost surely, 2^666775742 is an apocalyptic number.

666775742 is a deficient number, since it is larger than the sum of its proper divisors (361103890).

666775742 is a wasteful number, since it uses less digits than its factorization.

666775742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6043.

The product of its digits is 2963520, while the sum is 50.

The square root of 666775742 is about 25822.0011230733. The cubic root of 666775742 is about 873.6281051784.

The spelling of 666775742 in words is "six hundred sixty-six million, seven hundred seventy-five thousand, seven hundred forty-two".