66869811 has 12 divisors (see below), whose sum is σ = 98946120. Its totient is φ = 43492320.

The previous prime is 66869807. The next prime is 66869827. The reversal of 66869811 is 11896866.

It is a happy number.

It is not a de Polignac number, because 66869811 - 2² = 66869807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66869111) 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, 90241 + ... + 90978.

It is an arithmetic number, because the mean of its divisors is an integer number (8245510).

Almost surely, 2^66869811 is an apocalyptic number.

66869811 is a deficient number, since it is larger than the sum of its proper divisors (32076309).

66869811 is a wasteful number, since it uses less digits than its factorization.

66869811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181266 (or 181263 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 66869811 is about 8177.3963460260. The cubic root of 66869811 is about 405.8915703715.

The spelling of 66869811 in words is "sixty-six million, eight hundred sixty-nine thousand, eight hundred eleven".