166363616443 has 4 divisors (see below), whose sum is σ = 168367997448. Its totient is φ = 164359235440.

The previous prime is 166363616387. The next prime is 166363616453. The reversal of 166363616443 is 344616363661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166363616443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166363616453) 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, 1002190378 + ... + 1002190543.

It is an arithmetic number, because the mean of its divisors is an integer number (42091999362).

Almost surely, 2^166363616443 is an apocalyptic number.

166363616443 is a deficient number, since it is larger than the sum of its proper divisors (2004381005).

166363616443 is an equidigital number, since it uses as much as digits as its factorization.

166363616443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004381004.

The product of its digits is 3359232, while the sum is 49.

The spelling of 166363616443 in words is "one hundred sixty-six billion, three hundred sixty-three million, six hundred sixteen thousand, four hundred forty-three".