166641967507 has 2 divisors, whose sum is σ = 166641967508. Its totient is φ = 166641967506.

The previous prime is 166641967487. The next prime is 166641967523. The reversal of 166641967507 is 705769146661.

It is a strong prime.

It is an emirp because it is prime and its reverse (705769146661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166641967507 is a prime.

It is not a weakly prime, because it can be changed into another prime (166641967537) 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, 83320983753 + 83320983754.

It is an arithmetic number, because the mean of its divisors is an integer number (83320983754).

Almost surely, 2^166641967507 is an apocalyptic number.

166641967507 is a deficient number, since it is larger than the sum of its proper divisors (1).

166641967507 is an equidigital number, since it uses as much as digits as its factorization.

166641967507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11430720, while the sum is 58.

The spelling of 166641967507 in words is "one hundred sixty-six billion, six hundred forty-one million, nine hundred sixty-seven thousand, five hundred seven".