166251375389 has 8 divisors (see below), whose sum is σ = 182864023680. Its totient is φ = 151137612780.

The previous prime is 166251375379. The next prime is 166251375401. The reversal of 166251375389 is 983573152661.

It is a de Polignac number, because none of the positive numbers 2^k-166251375389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166251375349) 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, 62452229 + ... + 62454890.

It is an arithmetic number, because the mean of its divisors is an integer number (22858002960).

Almost surely, 2^166251375389 is an apocalyptic number.

It is an amenable number.

166251375389 is a deficient number, since it is larger than the sum of its proper divisors (16612648291).

166251375389 is an equidigital number, since it uses as much as digits as its factorization.

166251375389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124907152 (or 124907130 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 56.

The spelling of 166251375389 in words is "one hundred sixty-six billion, two hundred fifty-one million, three hundred seventy-five thousand, three hundred eighty-nine".