66665396 has 12 divisors (see below), whose sum is σ = 133330848. Its totient is φ = 28570872.

The previous prime is 66665383. The next prime is 66665399. The reversal of 66665396 is 69356666.

66665396 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 66665396.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665399) 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 3 ways as a sum of consecutive naturals, for example, 1190426 + ... + 1190481.

It is an arithmetic number, because the mean of its divisors is an integer number (11110904).

Almost surely, 2^66665396 is an apocalyptic number.

It is an amenable number.

66665396 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66665396 is a wasteful number, since it uses less digits than its factorization.

66665396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380918 (or 2380916 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 47.

The square root of 66665396 is about 8164.8879967823. The cubic root of 66665396 is about 405.4775568714.

The spelling of 66665396 in words is "sixty-six million, six hundred sixty-five thousand, three hundred ninety-six".