66661304340 has 96 divisors (see below), whose sum is σ = 194867640576. Its totient is φ = 16994672640.

The previous prime is 66661304323. The next prime is 66661304351. The reversal of 66661304340 is 4340316666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2904510 + ... + 2927370.

It is an arithmetic number, because the mean of its divisors is an integer number (2029871256).

Almost surely, 2^66661304340 is an apocalyptic number.

66661304340 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 66661304340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97433820288).

66661304340 is an abundant number, since it is smaller than the sum of its proper divisors (128206336236).

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

66661304340 is a wasteful number, since it uses less digits than its factorization.

66661304340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25009 (or 25007 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 39.

The spelling of 66661304340 in words is "sixty-six billion, six hundred sixty-one million, three hundred four thousand, three hundred forty".