66681115195 has 16 divisors (see below), whose sum is σ = 80127452160. Its totient is φ = 53271545184.

The previous prime is 66681115181. The next prime is 66681115217. The reversal of 66681115195 is 59151118666.

It is a cyclic number.

It is not a de Polignac number, because 66681115195 - 2⁹ = 66681114683 is a prime.

It is a super-2 number, since 2×66681115195² (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 15 ways as a sum of consecutive naturals, for example, 16155222 + ... + 16159348.

It is an arithmetic number, because the mean of its divisors is an integer number (5007965760).

Almost surely, 2^66681115195 is an apocalyptic number.

66681115195 is a deficient number, since it is larger than the sum of its proper divisors (13446336965).

66681115195 is a wasteful number, since it uses less digits than its factorization.

66681115195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7794.

The product of its digits is 388800, while the sum is 49.

The spelling of 66681115195 in words is "sixty-six billion, six hundred eighty-one million, one hundred fifteen thousand, one hundred ninety-five".