66111802280 has 64 divisors (see below), whose sum is σ = 153948384000. Its totient is φ = 25521640704.

The previous prime is 66111802259. The next prime is 66111802283. The reversal of 66111802280 is 8220811166.

It is a self number, because there is not a number n which added to its sum of digits gives 66111802280.

It is not an unprimeable number, because it can be changed into a prime (66111802283) 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, 2934017 + ... + 2956463.

It is an arithmetic number, because the mean of its divisors is an integer number (2405443500).

Almost surely, 2^66111802280 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 66111802280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76974192000).

66111802280 is an abundant number, since it is smaller than the sum of its proper divisors (87836581720).

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

66111802280 is a wasteful number, since it uses less digits than its factorization.

66111802280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25026 (or 25022 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The spelling of 66111802280 in words is "sixty-six billion, one hundred eleven million, eight hundred two thousand, two hundred eighty".