66715185512 has 16 divisors (see below), whose sum is σ = 125113502340. Its totient is φ = 33351584896.

The previous prime is 66715185499. The next prime is 66715185521. The reversal of 66715185512 is 21558151766.

It can be written as a sum of positive squares in 2 ways, for example, as 45119707396 + 21595478116 = 212414^2 + 146954^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703613 + ... + 792780.

Almost surely, 2^66715185512 is an apocalyptic number.

It is an amenable number.

66715185512 is a deficient number, since it is larger than the sum of its proper divisors (58398316828).

66715185512 is a wasteful number, since it uses less digits than its factorization.

66715185512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501972 (or 1501968 counting only the distinct ones).

The product of its digits is 504000, while the sum is 47.

The spelling of 66715185512 in words is "sixty-six billion, seven hundred fifteen million, one hundred eighty-five thousand, five hundred twelve".