666140874037231 has 2 divisors, whose sum is σ = 666140874037232. Its totient is φ = 666140874037230.

The previous prime is 666140874037091. The next prime is 666140874037237. The reversal of 666140874037231 is 132730478041666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666140874037231 - 2²³ = 666140865648623 is a prime.

It is a super-2 number, since 2×666140874037231² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666140874037237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333070437018615 + 333070437018616.

It is an arithmetic number, because the mean of its divisors is an integer number (333070437018616).

Almost surely, 2^{666140874037231} is an apocalyptic number.

666140874037231 is a deficient number, since it is larger than the sum of its proper divisors (1).

666140874037231 is an equidigital number, since it uses as much as digits as its factorization.

666140874037231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24385536, while the sum is 58.

The spelling of 666140874037231 in words is "six hundred sixty-six trillion, one hundred forty billion, eight hundred seventy-four million, thirty-seven thousand, two hundred thirty-one".