66416606388 has 36 divisors (see below), whose sum is σ = 183148824768. Its totient is φ = 20126244240.

The previous prime is 66416606369. The next prime is 66416606393. The reversal of 66416606388 is 88360661466.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×66416606388² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83858956 + ... + 83859747.

Almost surely, 2^66416606388 is an apocalyptic number.

It is an amenable number.

66416606388 is an abundant number, since it is smaller than the sum of its proper divisors (116732218380).

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

66416606388 is a wasteful number, since it uses less digits than its factorization.

66416606388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167718724 (or 167718719 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The spelling of 66416606388 in words is "sixty-six billion, four hundred sixteen million, six hundred six thousand, three hundred eighty-eight".