66375320 has 64 divisors (see below), whose sum is σ = 165659040. Its totient is φ = 23731200.

The previous prime is 66375313. The next prime is 66375329. The reversal of 66375320 is 2357366.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66375329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25604 + ... + 28076.

Almost surely, 2^66375320 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 66375320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82829520).

66375320 is an abundant number, since it is smaller than the sum of its proper divisors (99283720).

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

66375320 is a wasteful number, since it uses less digits than its factorization.

66375320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556 (or 2552 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 66375320 is about 8147.1050073017. The cubic root of 66375320 is about 404.8885940592. Note that the first 3 decimals are identical.

The spelling of 66375320 in words is "sixty-six million, three hundred seventy-five thousand, three hundred twenty".