66798240264 has 384 divisors, whose sum is σ = 229927526400. Its totient is φ = 17087293440.

The previous prime is 66798240253. The next prime is 66798240373. The reversal of 66798240264 is 46204289766.

It is a self number, because there is not a number n which added to its sum of digits gives 66798240264.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12762192 + ... + 12767424.

It is an arithmetic number, because the mean of its divisors is an integer number (598769600).

Almost surely, 2^66798240264 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 66798240264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114963763200).

66798240264 is an abundant number, since it is smaller than the sum of its proper divisors (163129286136).

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

66798240264 is a wasteful number, since it uses less digits than its factorization.

66798240264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5345 (or 5338 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 66798240264 in words is "sixty-six billion, seven hundred ninety-eight million, two hundred forty thousand, two hundred sixty-four".