666211527367189 has 2 divisors, whose sum is σ = 666211527367190. Its totient is φ = 666211527367188.

The previous prime is 666211527367121. The next prime is 666211527367201. The reversal of 666211527367189 is 981763725112666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 524197830064689 + 142013697302500 = 22895367^2 + 11916950^2 .

It is a cyclic number.

It is not a de Polignac number, because 666211527367189 - 2⁹ = 666211527366677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666211527367489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333105763683594 + 333105763683595.

It is an arithmetic number, because the mean of its divisors is an integer number (333105763683595).

Almost surely, 2^{666211527367189} is an apocalyptic number.

It is an amenable number.

666211527367189 is a deficient number, since it is larger than the sum of its proper divisors (1).

666211527367189 is an equidigital number, since it uses as much as digits as its factorization.

666211527367189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 274337280, while the sum is 70.

The spelling of 666211527367189 in words is "six hundred sixty-six trillion, two hundred eleven billion, five hundred twenty-seven million, three hundred sixty-seven thousand, one hundred eighty-nine".