66565006680 has 128 divisors (see below), whose sum is σ = 206702714880. Its totient is φ = 17130908160.

The previous prime is 66565006667. The next prime is 66565006687. The reversal of 66565006680 is 8660056566.

It is a super-2 number, since 2×66565006680² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66565006687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1340862 + ... + 1389618.

It is an arithmetic number, because the mean of its divisors is an integer number (1614864960).

Almost surely, 2^66565006680 is an apocalyptic number.

66565006680 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 66565006680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103351357440).

66565006680 is an abundant number, since it is smaller than the sum of its proper divisors (140137708200).

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

66565006680 is a wasteful number, since it uses less digits than its factorization.

66565006680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49169 (or 49165 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 66565006680 in words is "sixty-six billion, five hundred sixty-five million, six thousand, six hundred eighty".