66186661465 has 8 divisors (see below), whose sum is σ = 79425376128. Its totient is φ = 52948407600.

The previous prime is 66186661451. The next prime is 66186661487. The reversal of 66186661465 is 56416668166.

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

It is a de Polignac number, because none of the positive numbers 2^k-66186661465 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486784 + ... + 607726.

It is an arithmetic number, because the mean of its divisors is an integer number (9928172016).

Almost surely, 2^66186661465 is an apocalyptic number.

It is an amenable number.

66186661465 is a deficient number, since it is larger than the sum of its proper divisors (13238714663).

66186661465 is a wasteful number, since it uses less digits than its factorization.

66186661465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230399.

The product of its digits is 7464960, while the sum is 55.

The spelling of 66186661465 in words is "sixty-six billion, one hundred eighty-six million, six hundred sixty-one thousand, four hundred sixty-five".