666743707707 has 48 divisors (see below), whose sum is σ = 1133814816000. Its totient is φ = 344619696960.

The previous prime is 666743707699. The next prime is 666743707727. The reversal of 666743707707 is 707707347666.

666743707707 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666743707707 - 2³ = 666743707699 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (666743707727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 714232 + ... + 1357797.

It is an arithmetic number, because the mean of its divisors is an integer number (23621142000).

Almost surely, 2^666743707707 is an apocalyptic number.

666743707707 is a deficient number, since it is larger than the sum of its proper divisors (467071108293).

666743707707 is a wasteful number, since it uses less digits than its factorization.

666743707707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072256 (or 2072249 counting only the distinct ones).

The product of its (nonzero) digits is 43563744, while the sum is 60.

The spelling of 666743707707 in words is "six hundred sixty-six billion, seven hundred forty-three million, seven hundred seven thousand, seven hundred seven".