66115861774 has 8 divisors (see below), whose sum is σ = 99187979328. Its totient is φ = 33053202000.

The previous prime is 66115861759. The next prime is 66115861811. The reversal of 66115861774 is 47716851166.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2346942 + ... + 2374945.

It is an arithmetic number, because the mean of its divisors is an integer number (12398497416).

Almost surely, 2^66115861774 is an apocalyptic number.

66115861774 is a deficient number, since it is larger than the sum of its proper divisors (33072117554).

66115861774 is a wasteful number, since it uses less digits than its factorization.

66115861774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4728890.

The product of its digits is 1693440, while the sum is 52.

The spelling of 66115861774 in words is "sixty-six billion, one hundred fifteen million, eight hundred sixty-one thousand, seven hundred seventy-four".