66917660 has 48 divisors (see below), whose sum is σ = 144595584. Its totient is φ = 26001408.

The previous prime is 66917659. The next prime is 66917663. The reversal of 66917660 is 6671966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66917663) 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, 241442 + ... + 241718.

It is an arithmetic number, because the mean of its divisors is an integer number (3012408).

Almost surely, 2^66917660 is an apocalyptic number.

It is an amenable number.

66917660 is an abundant number, since it is smaller than the sum of its proper divisors (77677924).

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

66917660 is a wasteful number, since it uses less digits than its factorization.

66917660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590 (or 588 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 66917660 is about 8180.3215095741. The cubic root of 66917660 is about 405.9883598141.

The spelling of 66917660 in words is "sixty-six million, nine hundred seventeen thousand, six hundred sixty".