666743938 has 16 divisors (see below), whose sum is σ = 1147245120. Its totient is φ = 284683536.

The previous prime is 666743933. The next prime is 666743951. The reversal of 666743938 is 839347666.

It is not an unprimeable number, because it can be changed into a prime (666743933) 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, 84756 + ... + 92287.

It is an arithmetic number, because the mean of its divisors is an integer number (71702820).

Almost surely, 2^666743938 is an apocalyptic number.

666743938 is a deficient number, since it is larger than the sum of its proper divisors (480501182).

666743938 is a wasteful number, since it uses less digits than its factorization.

666743938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177321.

The product of its digits is 3919104, while the sum is 52.

The square root of 666743938 is about 25821.3852842949. The cubic root of 666743938 is about 873.6142147960.

It can be divided in two parts, 6667 and 43938, that added together give a palindrome (50605).

The spelling of 666743938 in words is "six hundred sixty-six million, seven hundred forty-three thousand, nine hundred thirty-eight".