166813713612 has 144 divisors (see below), whose sum is σ = 519387581440. Its totient is φ = 43959936384.

The previous prime is 166813713593. The next prime is 166813713617. The reversal of 166813713612 is 216317318661.

166813713612 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 13 + 7 + 13 + 612 = 666.

It is not an unprimeable number, because it can be changed into a prime (166813713617) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4249089 + ... + 4288167.

Almost surely, 2^166813713612 is an apocalyptic number.

166813713612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166813713612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259693790720).

166813713612 is an abundant number, since it is smaller than the sum of its proper divisors (352573867828).

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

166813713612 is a wasteful number, since it uses less digits than its factorization.

166813713612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40412 (or 40407 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 166813713612 in words is "one hundred sixty-six billion, eight hundred thirteen million, seven hundred thirteen thousand, six hundred twelve".