166644400043 has 8 divisors (see below), whose sum is σ = 191361990720. Its totient is φ = 143521492680.

The previous prime is 166644399997. The next prime is 166644400049. The reversal of 166644400043 is 340004446661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166644400043 - 2¹² = 166644395947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166644400049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398670605 + ... + 398671022.

It is an arithmetic number, because the mean of its divisors is an integer number (23920248840).

Almost surely, 2^166644400043 is an apocalyptic number.

166644400043 is a deficient number, since it is larger than the sum of its proper divisors (24717590677).

166644400043 is a wasteful number, since it uses less digits than its factorization.

166644400043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797341657.

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 166644400043 in words is "one hundred sixty-six billion, six hundred forty-four million, four hundred thousand, forty-three".