66625320 has 64 divisors (see below), whose sum is σ = 204145920. Its totient is φ = 17387264.

The previous prime is 66625309. The next prime is 66625327. The reversal of 66625320 is 2352666.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (66625327) 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, 267 + ... + 11546.

It is an arithmetic number, because the mean of its divisors is an integer number (3189780).

Almost surely, 2^66625320 is an apocalyptic number.

66625320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66625320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102072960).

66625320 is an abundant number, since it is smaller than the sum of its proper divisors (137520600).

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

66625320 is a wasteful number, since it uses less digits than its factorization.

66625320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11874 (or 11870 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 66625320 is about 8162.4334606783. The cubic root of 66625320 is about 405.3962894431.

Adding to 66625320 its reverse (2352666), we get a palindrome (68977986).

The spelling of 66625320 in words is "sixty-six million, six hundred twenty-five thousand, three hundred twenty".