66993516 has 36 divisors (see below), whose sum is σ = 170689792. Its totient is φ = 22153824.

The previous prime is 66993499. The next prime is 66993517. The reversal of 66993516 is 61539966.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (66993517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2755 + ... + 11898.

Almost surely, 2^66993516 is an apocalyptic number.

It is an amenable number.

66993516 is an abundant number, since it is smaller than the sum of its proper divisors (103696276).

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

66993516 is a wasteful number, since it uses less digits than its factorization.

66993516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14790 (or 14785 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 66993516 is about 8184.9566889508. The cubic root of 66993516 is about 406.1417075931.

The spelling of 66993516 in words is "sixty-six million, nine hundred ninety-three thousand, five hundred sixteen".