66993500 has 48 divisors (see below), whose sum is σ = 167224512. Its totient is φ = 22968000.

The previous prime is 66993499. The next prime is 66993517. The reversal of 66993500 is 539966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6071 + ... + 13070.

It is an arithmetic number, because the mean of its divisors is an integer number (3483844).

Almost surely, 2^66993500 is an apocalyptic number.

It is an amenable number.

66993500 is an abundant number, since it is smaller than the sum of its proper divisors (100231012).

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

66993500 is a wasteful number, since it uses less digits than its factorization.

66993500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19167 (or 19155 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 38.

The square root of 66993500 is about 8184.9557115479. The cubic root of 66993500 is about 406.1416752603.

The spelling of 66993500 in words is "sixty-six million, nine hundred ninety-three thousand, five hundred".