166861174164 has 48 divisors (see below), whose sum is σ = 389869807488. Its totient is φ = 55545159168.

The previous prime is 166861174141. The next prime is 166861174171. The reversal of 166861174164 is 461471168661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39566584 + ... + 39570800.

It is an arithmetic number, because the mean of its divisors is an integer number (8122287656).

Almost surely, 2^166861174164 is an apocalyptic number.

It is an amenable number.

166861174164 is an abundant number, since it is smaller than the sum of its proper divisors (223008633324).

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

166861174164 is a wasteful number, since it uses less digits than its factorization.

166861174164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7904 (or 7902 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The spelling of 166861174164 in words is "one hundred sixty-six billion, eight hundred sixty-one million, one hundred seventy-four thousand, one hundred sixty-four".