666140632072347 has 16 divisors (see below), whose sum is σ = 889574881825280. Its totient is φ = 443400258153312.

The previous prime is 666140632072327. The next prime is 666140632072379. The reversal of 666140632072347 is 743270236041666.

It is a happy number.

It is not a de Polignac number, because 666140632072347 - 2⁶ = 666140632072283 is a prime.

It is a super-2 number, since 2×666140632072347² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666140632072327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9647773 + ... + 37753950.

It is an arithmetic number, because the mean of its divisors is an integer number (55598430114080).

Almost surely, 2^{666140632072347} is an apocalyptic number.

666140632072347 is a deficient number, since it is larger than the sum of its proper divisors (223434249752933).

666140632072347 is a wasteful number, since it uses less digits than its factorization.

666140632072347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47409042.

The product of its (nonzero) digits is 36578304, while the sum is 57.

The spelling of 666140632072347 in words is "six hundred sixty-six trillion, one hundred forty billion, six hundred thirty-two million, seventy-two thousand, three hundred forty-seven".