66137660 has 12 divisors (see below), whose sum is σ = 138889128. Its totient is φ = 26455056.

The previous prime is 66137641. The next prime is 66137681. The reversal of 66137660 is 6673166.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66137660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1653422 + ... + 1653461.

It is an arithmetic number, because the mean of its divisors is an integer number (11574094).

Almost surely, 2^66137660 is an apocalyptic number.

It is an amenable number.

66137660 is an abundant number, since it is smaller than the sum of its proper divisors (72751468).

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

66137660 is a wasteful number, since it uses less digits than its factorization.

66137660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306892 (or 3306890 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 66137660 is about 8132.5063787248. The cubic root of 66137660 is about 404.4047751773.

The spelling of 66137660 in words is "sixty-six million, one hundred thirty-seven thousand, six hundred sixty".