666140615680531 has 2 divisors, whose sum is σ = 666140615680532. Its totient is φ = 666140615680530.

The previous prime is 666140615680391. The next prime is 666140615680577. The reversal of 666140615680531 is 135086516041666.

666140615680531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666140615680531 - 2⁹ = 666140615680019 is a prime.

It is a super-2 number, since 2×666140615680531² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666140615687531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333070307840265 + 333070307840266.

It is an arithmetic number, because the mean of its divisors is an integer number (333070307840266).

Almost surely, 2^{666140615680531} is an apocalyptic number.

666140615680531 is a deficient number, since it is larger than the sum of its proper divisors (1).

666140615680531 is an equidigital number, since it uses as much as digits as its factorization.

666140615680531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18662400, while the sum is 58.

The spelling of 666140615680531 in words is "six hundred sixty-six trillion, one hundred forty billion, six hundred fifteen million, six hundred eighty thousand, five hundred thirty-one".