66515265216 has 42 divisors (see below), whose sum is σ = 190653999692. Its totient is φ = 22171754880.

The previous prime is 66515265199. The next prime is 66515265221. The reversal of 66515265216 is 61256251566.

66515265216 is a `hidden beast` number, since 6 + 65 + 1 + 526 + 52 + 16 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57738370 + ... + 57739521.

Almost surely, 2^66515265216 is an apocalyptic number.

It is an amenable number.

66515265216 is an abundant number, since it is smaller than the sum of its proper divisors (124138734476).

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

66515265216 is a wasteful number, since it uses less digits than its factorization.

66515265216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115477909 (or 115477896 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 66515265216 in words is "sixty-six billion, five hundred fifteen million, two hundred sixty-five thousand, two hundred sixteen".