666740340737 has 8 divisors (see below), whose sum is σ = 701233908480. Its totient is φ = 633058386480.

The previous prime is 666740340691. The next prime is 666740340743. The reversal of 666740340737 is 737043047666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666740340737 - 2⁸ = 666740340481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666740390737) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 202901687 + ... + 202904972.

It is an arithmetic number, because the mean of its divisors is an integer number (87654238560).

Almost surely, 2^666740340737 is an apocalyptic number.

It is an amenable number.

666740340737 is a deficient number, since it is larger than the sum of its proper divisors (34493567743).

666740340737 is a wasteful number, since it uses less digits than its factorization.

666740340737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405806743.

The product of its (nonzero) digits is 10668672, while the sum is 53.

The spelling of 666740340737 in words is "six hundred sixty-six billion, seven hundred forty million, three hundred forty thousand, seven hundred thirty-seven".