66061140 has 72 divisors (see below), whose sum is σ = 188418720. Its totient is φ = 17293056.

The previous prime is 66061123. The next prime is 66061153. The reversal of 66061140 is 4116066.

It is a self number, because there is not a number n which added to its sum of digits gives 66061140.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 475191 + ... + 475329.

Almost surely, 2^66061140 is an apocalyptic number.

66061140 is a gapful number since it is divisible by the number (60) 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 66061140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94209360).

66061140 is an abundant number, since it is smaller than the sum of its proper divisors (122357580).

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

66061140 is a wasteful number, since it uses less digits than its factorization.

66061140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 66061140 is about 8127.8004404636. The cubic root of 66061140 is about 404.2487521422.

The spelling of 66061140 in words is "sixty-six million, sixty-one thousand, one hundred forty".