66168756 has 72 divisors (see below), whose sum is σ = 174091008. Its totient is φ = 21168000.

The previous prime is 66168737. The next prime is 66168779. The reversal of 66168756 is 65786166.

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, 235336 + ... + 235616.

Almost surely, 2^66168756 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 66168756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87045504).

66168756 is an abundant number, since it is smaller than the sum of its proper divisors (107922252).

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

66168756 is a wasteful number, since it uses less digits than its factorization.

66168756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533 (or 528 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 66168756 is about 8134.4179877850. The cubic root of 66168756 is about 404.4681450262.

The spelling of 66168756 in words is "sixty-six million, one hundred sixty-eight thousand, seven hundred fifty-six".