66587812 has 12 divisors (see below), whose sum is σ = 117618480. Its totient is φ = 32982536.

The previous prime is 66587809. The next prime is 66587819. The reversal of 66587812 is 21878566.

It is not an unprimeable number, because it can be changed into a prime (66587819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77362 + ... + 78217.

It is an arithmetic number, because the mean of its divisors is an integer number (9801540).

Almost surely, 2^66587812 is an apocalyptic number.

It is an amenable number.

66587812 is a deficient number, since it is larger than the sum of its proper divisors (51030668).

66587812 is a wasteful number, since it uses less digits than its factorization.

66587812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155690 (or 155688 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 66587812 is about 8160.1355380900. The cubic root of 66587812 is about 405.3201999606.

The spelling of 66587812 in words is "sixty-six million, five hundred eighty-seven thousand, eight hundred twelve".