66421425560 has 64 divisors (see below), whose sum is σ = 180844902720. Its totient is φ = 21433466880.

The previous prime is 66421425533. The next prime is 66421425563. The reversal of 66421425560 is 6552412466.

66421425560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66421425563) 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, 6972281 + ... + 6981800.

It is an arithmetic number, because the mean of its divisors is an integer number (2825701605).

Almost surely, 2^66421425560 is an apocalyptic number.

It is an amenable number.

66421425560 is an abundant number, since it is smaller than the sum of its proper divisors (114423477160).

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

66421425560 is a wasteful number, since it uses less digits than its factorization.

66421425560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13954116 (or 13954112 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 66421425560 in words is "sixty-six billion, four hundred twenty-one million, four hundred twenty-five thousand, five hundred sixty".