66491068 has 54 divisors (see below), whose sum is σ = 141121176. Its totient is φ = 26850384.

The previous prime is 66491059. The next prime is 66491069. The reversal of 66491068 is 86019466.

It is a self number, because there is not a number n which added to its sum of digits gives 66491068.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66491069) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 992371 + ... + 992437.

Almost surely, 2^66491068 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 66491068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70560588).

66491068 is an abundant number, since it is smaller than the sum of its proper divisors (74630108).

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

66491068 is a wasteful number, since it uses less digits than its factorization.

66491068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 66491068 is about 8154.2055407011. The cubic root of 66491068 is about 405.1238111530.

The spelling of 66491068 in words is "sixty-six million, four hundred ninety-one thousand, sixty-eight".