66135566115 has 12 divisors (see below), whose sum is σ = 114634981344. Its totient is φ = 35272301904.

The previous prime is 66135566113. The next prime is 66135566209. The reversal of 66135566115 is 51166553166.

66135566115 is a `hidden beast` number, since 66 + 13 + 5 + 566 + 1 + 15 = 666.

It is not a de Polignac number, because 66135566115 - 2¹ = 66135566113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1469679247 = 66135566115 / (6 + 6 + 1 + 3 + 5 + 5 + 6 + 6 + 1 + 1 + 5).

It is not an unprimeable number, because it can be changed into a prime (66135566113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 734839579 + ... + 734839668.

It is an arithmetic number, because the mean of its divisors is an integer number (9552915112).

Almost surely, 2^66135566115 is an apocalyptic number.

66135566115 is a deficient number, since it is larger than the sum of its proper divisors (48499415229).

66135566115 is a wasteful number, since it uses less digits than its factorization.

66135566115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469679258 (or 1469679255 counting only the distinct ones).

The product of its digits is 486000, while the sum is 45.

It can be divided in two parts, 66135 and 566115, that added together give a triangular number (632250 = T₁₁₂₄).

The spelling of 66135566115 in words is "sixty-six billion, one hundred thirty-five million, five hundred sixty-six thousand, one hundred fifteen".