66601350864 has 120 divisors (see below), whose sum is σ = 199418263200. Its totient is φ = 20687166720.

The previous prime is 66601350853. The next prime is 66601350869. The reversal of 66601350864 is 46805310666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66601350869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32634 + ... + 366425.

It is an arithmetic number, because the mean of its divisors is an integer number (1661818860).

Almost surely, 2^66601350864 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 66601350864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99709131600).

66601350864 is an abundant number, since it is smaller than the sum of its proper divisors (132816912336).

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

66601350864 is a wasteful number, since it uses less digits than its factorization.

66601350864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399153 (or 399144 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 66601350864 in words is "sixty-six billion, six hundred one million, three hundred fifty thousand, eight hundred sixty-four".