66515338116 has 36 divisors (see below), whose sum is σ = 178026347772. Its totient is φ = 20867556864.

The previous prime is 66515338093. The next prime is 66515338151. The reversal of 66515338116 is 61183351566.

66515338116 is a `hidden beast` number, since 66 + 51 + 533 + 8 + 1 + 1 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51984000000 + 14531338116 = 228000^2 + 120546^2 .

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

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, 54341985 + ... + 54343208.

It is an arithmetic number, because the mean of its divisors is an integer number (4945176327).

Almost surely, 2^66515338116 is an apocalyptic number.

It is an amenable number.

66515338116 is an abundant number, since it is smaller than the sum of its proper divisors (111511009656).

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

66515338116 is a wasteful number, since it uses less digits than its factorization.

66515338116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108685220 (or 108685215 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The spelling of 66515338116 in words is "sixty-six billion, five hundred fifteen million, three hundred thirty-eight thousand, one hundred sixteen".