66907690416 has 320 divisors, whose sum is σ = 223985664000. Its totient is φ = 18728527104.

The previous prime is 66907690379. The next prime is 66907690433. The reversal of 66907690416 is 61409670966.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31874935 + ... + 31877033.

It is an arithmetic number, because the mean of its divisors is an integer number (699955200).

Almost surely, 2^66907690416 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 66907690416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111992832000).

66907690416 is an abundant number, since it is smaller than the sum of its proper divisors (157077973584).

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

66907690416 is a wasteful number, since it uses less digits than its factorization.

66907690416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333 (or 2321 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 66907690416 in words is "sixty-six billion, nine hundred seven million, six hundred ninety thousand, four hundred sixteen".