166006401791 has 2 divisors, whose sum is σ = 166006401792. Its totient is φ = 166006401790.

The previous prime is 166006401787. The next prime is 166006401839. The reversal of 166006401791 is 197104600661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166006401791 - 2² = 166006401787 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166006401721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83003200895 + 83003200896.

It is an arithmetic number, because the mean of its divisors is an integer number (83003200896).

Almost surely, 2^166006401791 is an apocalyptic number.

166006401791 is a deficient number, since it is larger than the sum of its proper divisors (1).

166006401791 is an equidigital number, since it uses as much as digits as its factorization.

166006401791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 166006401791 in words is "one hundred sixty-six billion, six million, four hundred one thousand, seven hundred ninety-one".