66601947258 has 192 divisors, whose sum is σ = 185027431680. Its totient is φ = 16810675200.

The previous prime is 66601947257. The next prime is 66601947271. The reversal of 66601947258 is 85274910666.

It is not an unprimeable number, because it can be changed into a prime (66601947257) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15284016 + ... + 15288372.

It is an arithmetic number, because the mean of its divisors is an integer number (963684540).

Almost surely, 2^66601947258 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66601947258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92513715840).

66601947258 is an abundant number, since it is smaller than the sum of its proper divisors (118425484422).

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

66601947258 is a wasteful number, since it uses less digits than its factorization.

66601947258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4693 (or 4690 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 66601947258 in words is "sixty-six billion, six hundred one million, nine hundred forty-seven thousand, two hundred fifty-eight".