166146205513 has 4 divisors (see below), whose sum is σ = 166176702100. Its totient is φ = 166115708928.

The previous prime is 166146205501. The next prime is 166146205523. The reversal of 166146205513 is 315502641661.

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: 315502641661 = 47 ⋅6712822163.

It can be written as a sum of positive squares in 2 ways, for example, as 41612736064 + 124533469449 = 203992^2 + 352893^2 .

It is a cyclic number.

It is not a de Polignac number, because 166146205513 - 2⁵ = 166146205481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166146205523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15240120 + ... + 15251017.

It is an arithmetic number, because the mean of its divisors is an integer number (41544175525).

Almost surely, 2^166146205513 is an apocalyptic number.

It is an amenable number.

166146205513 is a deficient number, since it is larger than the sum of its proper divisors (30496587).

166146205513 is an equidigital number, since it uses as much as digits as its factorization.

166146205513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30496586.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 166146205513 in words is "one hundred sixty-six billion, one hundred forty-six million, two hundred five thousand, five hundred thirteen".