166464545464661 has 4 divisors (see below), whose sum is σ = 166464582069324. Its totient is φ = 166464508860000.

The previous prime is 166464545464517. The next prime is 166464545464673.

166464545464661 is nontrivially palindromic in base 10.

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 83499955384561 + 82964590080100 = 9137831^2 + 9108490^2 .

It is a cyclic number.

It is not a de Polignac number, because 166464545464661 - 2¹⁴ = 166464545448277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166464545464591 and 166464545464600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166464545464361) 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, 10320590 + ... + 20962911.

It is an arithmetic number, because the mean of its divisors is an integer number (41616145517331).

Almost surely, 2^{166464545464661} is an apocalyptic number.

It is an amenable number.

166464545464661 is a deficient number, since it is larger than the sum of its proper divisors (36604663).

166464545464661 is an equidigital number, since it uses as much as digits as its factorization.

166464545464661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36604662.

The product of its digits is 1194393600, while the sum is 68.

The spelling of 166464545464661 in words is "one hundred sixty-six trillion, four hundred sixty-four billion, five hundred forty-five million, four hundred sixty-four thousand, six hundred sixty-one".