66915851966 has 8 divisors (see below), whose sum is σ = 100746915480. Its totient is φ = 33333546808.

The previous prime is 66915851927. The next prime is 66915851999.

66915851966 is nontrivially palindromic in base 10.

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

It is a junction number, because it is equal to n+sod(n) for n = 66915851899 and 66915851908.

It is a congruent number.

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, 62188916 + ... + 62189991.

It is an arithmetic number, because the mean of its divisors is an integer number (12593364435).

Almost surely, 2^66915851966 is an apocalyptic number.

66915851966 is a deficient number, since it is larger than the sum of its proper divisors (33831063514).

66915851966 is a wasteful number, since it uses less digits than its factorization.

66915851966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124379178.

The product of its digits is 20995200, while the sum is 62.

The spelling of 66915851966 in words is "sixty-six billion, nine hundred fifteen million, eight hundred fifty-one thousand, nine hundred sixty-six".