166620106346345 has 4 divisors (see below), whose sum is σ = 199944127615620. Its totient is φ = 133296085077072.

The previous prime is 166620106346341. The next prime is 166620106346423. The reversal of 166620106346345 is 543643601026661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50310265978729 + 116309840367616 = 7092973^2 + 10784704^2 .

It is a cyclic number.

It is not a de Polignac number, because 166620106346345 - 2² = 166620106346341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166620106346341) 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, 16662010634630 + ... + 16662010634639.

It is an arithmetic number, because the mean of its divisors is an integer number (49986031903905).

Almost surely, 2^{166620106346345} is an apocalyptic number.

It is an amenable number.

166620106346345 is a deficient number, since it is larger than the sum of its proper divisors (33324021269275).

166620106346345 is an equidigital number, since it uses as much as digits as its factorization.

166620106346345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33324021269274.

The product of its (nonzero) digits is 11197440, while the sum is 53.

The spelling of 166620106346345 in words is "one hundred sixty-six trillion, six hundred twenty billion, one hundred six million, three hundred forty-six thousand, three hundred forty-five".