66730064940 has 648 divisors, whose sum is σ = 267294658176. Its totient is φ = 13412044800.

The previous prime is 66730064923. The next prime is 66730064941. The reversal of 66730064940 is 4946003766.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (66730064941) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 33082812 + ... + 33084828.

Almost surely, 2^66730064940 is an apocalyptic number.

66730064940 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 66730064940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133647329088).

66730064940 is an abundant number, since it is smaller than the sum of its proper divisors (200564593236).

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

66730064940 is a wasteful number, since it uses less digits than its factorization.

66730064940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099 (or 2076 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The spelling of 66730064940 in words is "sixty-six billion, seven hundred thirty million, sixty-four thousand, nine hundred forty".