66601516066 has 8 divisors (see below), whose sum is σ = 99905873004. Its totient is φ = 33299558400.

The previous prime is 66601516027. The next prime is 66601516073. The reversal of 66601516066 is 66061510666.

It can be written as a sum of positive squares in 2 ways, for example, as 62489500441 + 4112015625 = 249979^2 + 64125^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66601516066² (a number of 22 digits) contains 22 as substring.

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, 528735 + ... + 642466.

Almost surely, 2^66601516066 is an apocalyptic number.

66601516066 is a deficient number, since it is larger than the sum of its proper divisors (33304356938).

66601516066 is a wasteful number, since it uses less digits than its factorization.

66601516066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199636.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 66601516066 in words is "sixty-six billion, six hundred one million, five hundred sixteen thousand, sixty-six".