666666740735 has 8 divisors (see below), whose sum is σ = 800007316416. Its totient is φ = 533328574240.

The previous prime is 666666740731. The next prime is 666666740767. The reversal of 666666740735 is 537047666666.

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

It is not a de Polignac number, because 666666740735 - 2² = 666666740731 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666740731) 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, 75917 + ... + 1157193.

It is an arithmetic number, because the mean of its divisors is an integer number (100000914552).

Almost surely, 2^666666740735 is an apocalyptic number.

666666740735 is a deficient number, since it is larger than the sum of its proper divisors (133340575681).

666666740735 is a wasteful number, since it uses less digits than its factorization.

666666740735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204593.

The product of its (nonzero) digits is 137168640, while the sum is 62.

The spelling of 666666740735 in words is "six hundred sixty-six billion, six hundred sixty-six million, seven hundred forty thousand, seven hundred thirty-five".