166362404263661 has 4 divisors (see below), whose sum is σ = 166462804026492. Its totient is φ = 166262004500832.

The previous prime is 166362404263651. The next prime is 166362404263687.

166362404263661 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 84329876596900 + 82032527666761 = 9183130^2 + 9057181^2 .

It is a cyclic number.

It is not a de Polignac number, because 166362404263661 - 2⁶ = 166362404263597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166362404263597 and 166362404263606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166362404263651) 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, 50199878930 + ... + 50199882243.

It is an arithmetic number, because the mean of its divisors is an integer number (41615701006623).

Almost surely, 2^{166362404263661} is an apocalyptic number.

It is an amenable number.

166362404263661 is a deficient number, since it is larger than the sum of its proper divisors (100399762831).

166362404263661 is a wasteful number, since it uses less digits than its factorization.

166362404263661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100399762830.

The product of its (nonzero) digits is 26873856, while the sum is 56.

The spelling of 166362404263661 in words is "one hundred sixty-six trillion, three hundred sixty-two billion, four hundred four million, two hundred sixty-three thousand, six hundred sixty-one".