6412891165666 has 32 divisors (see below), whose sum is σ = 10391397880320. Its totient is φ = 2956883694336.

The previous prime is 6412891165661. The next prime is 6412891165693. The reversal of 6412891165666 is 6665611982146.

It is a super-2 number, since 2×6412891165666² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6412891165661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1076146 + ... + 3739501.

It is an arithmetic number, because the mean of its divisors is an integer number (324731183760).

Almost surely, 2^{6412891165666} is an apocalyptic number.

6412891165666 is a deficient number, since it is larger than the sum of its proper divisors (3978506714654).

6412891165666 is a wasteful number, since it uses less digits than its factorization.

6412891165666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4816458.

The product of its digits is 22394880, while the sum is 61.

The spelling of 6412891165666 in words is "six trillion, four hundred twelve billion, eight hundred ninety-one million, one hundred sixty-five thousand, six hundred sixty-six".