166345326545 has 4 divisors (see below), whose sum is σ = 199614391860. Its totient is φ = 133076261232.

The previous prime is 166345326473. The next prime is 166345326559. The reversal of 166345326545 is 545623543661.

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 51932940544 + 114412386001 = 227888^2 + 338249^2 .

It is a cyclic number.

It is not a de Polignac number, because 166345326545 - 2¹⁴ = 166345310161 is a prime.

It is a super-3 number, since 3×166345326545³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166345326493 and 166345326502.

It is an unprimeable number.

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, 16634532650 + ... + 16634532659.

It is an arithmetic number, because the mean of its divisors is an integer number (49903597965).

Almost surely, 2^166345326545 is an apocalyptic number.

It is an amenable number.

166345326545 is a deficient number, since it is larger than the sum of its proper divisors (33269065315).

166345326545 is an equidigital number, since it uses as much as digits as its factorization.

166345326545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33269065314.

The product of its digits is 7776000, while the sum is 50.

The spelling of 166345326545 in words is "one hundred sixty-six billion, three hundred forty-five million, three hundred twenty-six thousand, five hundred forty-five".