166851868734 has 160 divisors (see below), whose sum is σ = 388174381056. Its totient is φ = 53531694720.

The previous prime is 166851868727. The next prime is 166851868763. The reversal of 166851868734 is 437868158661.

166851868734 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 518 + 6 + 87 + 34 = 666.

It is a super-2 number, since 2×166851868734² (a number of 23 digits) contains 22 as substring.

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, 188107639 + ... + 188108525.

Almost surely, 2^166851868734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166851868734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194087190528).

166851868734 is an abundant number, since it is smaller than the sum of its proper divisors (221322512322).

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

166851868734 is a wasteful number, since it uses less digits than its factorization.

166851868734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292 (or 1283 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 63.

The spelling of 166851868734 in words is "one hundred sixty-six billion, eight hundred fifty-one million, eight hundred sixty-eight thousand, seven hundred thirty-four".