666343526531 has 2 divisors, whose sum is σ = 666343526532. Its totient is φ = 666343526530.

The previous prime is 666343526503. The next prime is 666343526609. The reversal of 666343526531 is 135625343666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666343526531 is a prime.

It is a super-2 number, since 2×666343526531² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666343526531.

It is not a weakly prime, because it can be changed into another prime (666343526831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333171763265 + 333171763266.

It is an arithmetic number, because the mean of its divisors is an integer number (333171763266).

Almost surely, 2^666343526531 is an apocalyptic number.

666343526531 is a deficient number, since it is larger than the sum of its proper divisors (1).

666343526531 is an equidigital number, since it uses as much as digits as its factorization.

666343526531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6998400, while the sum is 50.

The spelling of 666343526531 in words is "six hundred sixty-six billion, three hundred forty-three million, five hundred twenty-six thousand, five hundred thirty-one".