166065340263 has 4 divisors (see below), whose sum is σ = 221420453688. Its totient is φ = 110710226840.

The previous prime is 166065340261. The next prime is 166065340277. The reversal of 166065340263 is 362043560661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 362043560661 = 3 ⋅120681186887.

It is a cyclic number.

It is not a de Polignac number, because 166065340263 - 2¹ = 166065340261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166065340261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27677556708 + ... + 27677556713.

It is an arithmetic number, because the mean of its divisors is an integer number (55355113422).

Almost surely, 2^166065340263 is an apocalyptic number.

166065340263 is a deficient number, since it is larger than the sum of its proper divisors (55355113425).

166065340263 is an equidigital number, since it uses as much as digits as its factorization.

166065340263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55355113424.

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 166065340263 in words is "one hundred sixty-six billion, sixty-five million, three hundred forty thousand, two hundred sixty-three".