66320300 has 18 divisors (see below), whose sum is σ = 143915268. Its totient is φ = 26528080.

The previous prime is 66320291. The next prime is 66320311. The reversal of 66320300 is 302366.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 331502 + ... + 331701.

Almost surely, 2^66320300 is an apocalyptic number.

It is an amenable number.

66320300 is an abundant number, since it is smaller than the sum of its proper divisors (77594968).

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

66320300 is a wasteful number, since it uses less digits than its factorization.

66320300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663217 (or 663210 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 66320300 is about 8143.7276477053. The cubic root of 66320300 is about 404.7766893704.

Adding to 66320300 its reverse (302366), we get a palindrome (66622666).

The spelling of 66320300 in words is "sixty-six million, three hundred twenty thousand, three hundred".