166861589148 has 72 divisors (see below), whose sum is σ = 438573582720. Its totient is φ = 53433377280.

The previous prime is 166861589029. The next prime is 166861589207. The reversal of 166861589148 is 841985168661.

166861589148 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 6 + 1 + 589 + 1 + 48 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 392793 + ... + 698576.

It is an arithmetic number, because the mean of its divisors is an integer number (6091299760).

Almost surely, 2^166861589148 is an apocalyptic number.

166861589148 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

166861589148 is an abundant number, since it is smaller than the sum of its proper divisors (271711993572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166861589148 is a wasteful number, since it uses less digits than its factorization.

166861589148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091547 (or 1091542 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 63.

The spelling of 166861589148 in words is "one hundred sixty-six billion, eight hundred sixty-one million, five hundred eighty-nine thousand, one hundred forty-eight".