166023504366191 has 2 divisors, whose sum is σ = 166023504366192. Its totient is φ = 166023504366190.

The previous prime is 166023504366179. The next prime is 166023504366241. The reversal of 166023504366191 is 191663405320661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (191663405320661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166023504366191 - 2¹⁰ = 166023504365167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166023504366991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83011752183095 + 83011752183096.

It is an arithmetic number, because the mean of its divisors is an integer number (83011752183096).

Almost surely, 2^{166023504366191} is an apocalyptic number.

166023504366191 is a deficient number, since it is larger than the sum of its proper divisors (1).

166023504366191 is an equidigital number, since it uses as much as digits as its factorization.

166023504366191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 53.

The spelling of 166023504366191 in words is "one hundred sixty-six trillion, twenty-three billion, five hundred four million, three hundred sixty-six thousand, one hundred ninety-one".