166644881413125 has 80 divisors (see below), whose sum is σ = 294004400526144. Its totient is φ = 83643702912000.

The previous prime is 166644881413103. The next prime is 166644881413141. The reversal of 166644881413125 is 521314188446661.

It is a happy number.

It is not a de Polignac number, because 166644881413125 - 2⁶ = 166644881413061 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 508975722 + ... + 509303028.

Almost surely, 2^{166644881413125} is an apocalyptic number.

166644881413125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166644881413125 is a deficient number, since it is larger than the sum of its proper divisors (127359519113019).

166644881413125 is a wasteful number, since it uses less digits than its factorization.

166644881413125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343320 (or 343305 counting only the distinct ones).

The product of its digits is 26542080, while the sum is 60.

The spelling of 166644881413125 in words is "one hundred sixty-six trillion, six hundred forty-four billion, eight hundred eighty-one million, four hundred thirteen thousand, one hundred twenty-five".