166851868652 has 48 divisors (see below), whose sum is σ = 343060038720. Its totient is φ = 69515443200.

The previous prime is 166851868639. The next prime is 166851868657. The reversal of 166851868652 is 256868158661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (166851868657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63974 + ... + 581202.

It is an arithmetic number, because the mean of its divisors is an integer number (7147084140).

Almost surely, 2^166851868652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166851868652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171530019360).

166851868652 is an abundant number, since it is smaller than the sum of its proper divisors (176208170068).

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

166851868652 is a wasteful number, since it uses less digits than its factorization.

166851868652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517562 (or 517560 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 62.

The spelling of 166851868652 in words is "one hundred sixty-six billion, eight hundred fifty-one million, eight hundred sixty-eight thousand, six hundred fifty-two".