166444725057 has 8 divisors (see below), whose sum is σ = 238997553984. Its totient is φ = 102427523088.

The previous prime is 166444725023. The next prime is 166444725059. The reversal of 166444725057 is 750527444661.

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

It is not a de Polignac number, because 166444725057 - 2¹¹ = 166444723009 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (166444725059) 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, 2133906693 + ... + 2133906770.

It is an arithmetic number, because the mean of its divisors is an integer number (29874694248).

Almost surely, 2^166444725057 is an apocalyptic number.

It is an amenable number.

166444725057 is a deficient number, since it is larger than the sum of its proper divisors (72552828927).

166444725057 is a wasteful number, since it uses less digits than its factorization.

166444725057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4267813479.

The product of its (nonzero) digits is 5644800, while the sum is 51.

The spelling of 166444725057 in words is "one hundred sixty-six billion, four hundred forty-four million, seven hundred twenty-five thousand, fifty-seven".