66612511 has 12 divisors (see below), whose sum is σ = 82047168. Its totient is φ = 53737152.

The previous prime is 66612503. The next prime is 66612517. The reversal of 66612511 is 11521666.

It is not a de Polignac number, because 66612511 - 2³ = 66612503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66612511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66612517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39151 + ... + 40816.

It is an arithmetic number, because the mean of its divisors is an integer number (6837264).

Almost surely, 2^66612511 is an apocalyptic number.

66612511 is a deficient number, since it is larger than the sum of its proper divisors (15434657).

66612511 is a wasteful number, since it uses less digits than its factorization.

66612511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79998 (or 79991 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 66612511 is about 8161.6487917577. The cubic root of 66612511 is about 405.3703080600.

The spelling of 66612511 in words is "sixty-six million, six hundred twelve thousand, five hundred eleven".