66985516 has 36 divisors (see below), whose sum is σ = 127833552. Its totient is φ = 30698304.

The previous prime is 66985493. The next prime is 66985517. The reversal of 66985516 is 61558966.

It is not an unprimeable number, because it can be changed into a prime (66985517) 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, 132921 + ... + 133423.

It is an arithmetic number, because the mean of its divisors is an integer number (3550932).

Almost surely, 2^66985516 is an apocalyptic number.

It is an amenable number.

66985516 is a deficient number, since it is larger than the sum of its proper divisors (60848036).

66985516 is a wasteful number, since it uses less digits than its factorization.

66985516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730 (or 715 counting only the distinct ones).

The product of its digits is 388800, while the sum is 46.

The square root of 66985516 is about 8184.4679729351. The cubic root of 66985516 is about 406.1255405409.

It can be divided in two parts, 66 and 985516, that multiplied together give a palindrome (65044056).

The spelling of 66985516 in words is "sixty-six million, nine hundred eighty-five thousand, five hundred sixteen".