66665376 has 192 divisors, whose sum is σ = 212889600. Its totient is φ = 20217600.

The previous prime is 66665371. The next prime is 66665383. The reversal of 66665376 is 67356666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 508831 + ... + 508961.

It is an arithmetic number, because the mean of its divisors is an integer number (1108800).

Almost surely, 2^66665376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66665376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106444800).

66665376 is an abundant number, since it is smaller than the sum of its proper divisors (146224224).

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

66665376 is a wasteful number, since it uses less digits than its factorization.

66665376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 186 counting only the distinct ones).

The product of its digits is 816480, while the sum is 45.

The square root of 66665376 is about 8164.8867720257. The cubic root of 66665376 is about 405.4775163229.

The spelling of 66665376 in words is "sixty-six million, six hundred sixty-five thousand, three hundred seventy-six".