666740066734 has 16 divisors (see below), whose sum is σ = 1143294414336. Its totient is φ = 285667882200.

The previous prime is 666740066491. The next prime is 666740066747. The reversal of 666740066734 is 437660047666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6435162 + ... + 6537949.

It is an arithmetic number, because the mean of its divisors is an integer number (71455900896).

Almost surely, 2^666740066734 is an apocalyptic number.

666740066734 is a deficient number, since it is larger than the sum of its proper divisors (476554347602).

666740066734 is a wasteful number, since it uses less digits than its factorization.

666740066734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12976791.

The product of its (nonzero) digits is 18289152, while the sum is 55.

The spelling of 666740066734 in words is "six hundred sixty-six billion, seven hundred forty million, sixty-six thousand, seven hundred thirty-four".