66907969920 has 448 divisors, whose sum is σ = 261639804240. Its totient is φ = 16218869760.

The previous prime is 66907969903. The next prime is 66907969949. The reversal of 66907969920 is 2996970966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 5125642 + ... + 5138678.

Almost surely, 2^66907969920 is an apocalyptic number.

66907969920 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 66907969920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130819902120).

66907969920 is an abundant number, since it is smaller than the sum of its proper divisors (194731834320).

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

66907969920 is a wasteful number, since it uses less digits than its factorization.

66907969920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13085 (or 13058 counting only the distinct ones).

The product of its (nonzero) digits is 19840464, while the sum is 63.

The spelling of 66907969920 in words is "sixty-six billion, nine hundred seven million, nine hundred sixty-nine thousand, nine hundred twenty".