66204662880840 has 64 divisors (see below), whose sum is σ = 216669805796160. Its totient is φ = 16049615243520.

The previous prime is 66204662880833. The next prime is 66204662880841. The reversal of 66204662880840 is 4808826640266.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (66204662880841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25077522499 + ... + 25077525138.

It is an arithmetic number, because the mean of its divisors is an integer number (3385465715565).

Almost surely, 2^{66204662880840} is an apocalyptic number.

66204662880840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66204662880840 is an abundant number, since it is smaller than the sum of its proper divisors (150465142915320).

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

66204662880840 is a wasteful number, since it uses less digits than its factorization.

66204662880840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50155047662 (or 50155047658 counting only the distinct ones).

The product of its (nonzero) digits is 42467328, while the sum is 60.

The spelling of 66204662880840 in words is "sixty-six trillion, two hundred four billion, six hundred sixty-two million, eight hundred eighty thousand, eight hundred forty".