66199100 has 54 divisors (see below), whose sum is σ = 157927392. Its totient is φ = 24068000.

The previous prime is 66199073. The next prime is 66199103. The reversal of 66199100 is 199166.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66199103) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9365 + ... + 14835.

Almost surely, 2^66199100 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 66199100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78963696).

66199100 is an abundant number, since it is smaller than the sum of its proper divisors (91728292).

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

66199100 is a wasteful number, since it uses less digits than its factorization.

66199100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5507 (or 5489 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 66199100 is about 8136.2829351000. The cubic root of 66199100 is about 404.5299632543.

The spelling of 66199100 in words is "sixty-six million, one hundred ninety-nine thousand, one hundred".