666895946219 has 16 divisors (see below), whose sum is σ = 707586140160. Its totient is φ = 626369331840.

The previous prime is 666895946201. The next prime is 666895946237. The reversal of 666895946219 is 912649598666.

It is an interprime number because it is at equal distance from previous prime (666895946201) and next prime (666895946237).

It is a cyclic number.

It is not a de Polignac number, because 666895946219 - 2²⁴ = 666879169003 is a prime.

It is a super-2 number, since 2×666895946219² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666895946239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18157664 + ... + 18194354.

It is an arithmetic number, because the mean of its divisors is an integer number (44224133760).

Almost surely, 2^666895946219 is an apocalyptic number.

666895946219 is a deficient number, since it is larger than the sum of its proper divisors (40690193941).

666895946219 is a wasteful number, since it uses less digits than its factorization.

666895946219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38890.

The product of its digits is 302330880, while the sum is 71.

The spelling of 666895946219 in words is "six hundred sixty-six billion, eight hundred ninety-five million, nine hundred forty-six thousand, two hundred nineteen".