166566026413 has 4 divisors (see below), whose sum is σ = 166905265248. Its totient is φ = 166226787580.

The previous prime is 166566026387. The next prime is 166566026441. The reversal of 166566026413 is 314620665661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 314620665661 = 31 ⋅10149053731.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166566026413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166566026513) 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, 169618681 + ... + 169619662.

It is an arithmetic number, because the mean of its divisors is an integer number (41726316312).

Almost surely, 2^166566026413 is an apocalyptic number.

It is an amenable number.

166566026413 is a deficient number, since it is larger than the sum of its proper divisors (339238835).

166566026413 is an equidigital number, since it uses as much as digits as its factorization.

166566026413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339238834.

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 166566026413 in words is "one hundred sixty-six billion, five hundred sixty-six million, twenty-six thousand, four hundred thirteen".