2166177670643 has 16 divisors (see below), whose sum is σ = 2617819760640. Its totient is φ = 1753004289600.

The previous prime is 2166177670627. The next prime is 2166177670669. The reversal of 2166177670643 is 3460767716612.

It is a cyclic number.

It is not a de Polignac number, because 2166177670643 - 2⁴ = 2166177670627 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2166177673643) 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, 121727513 + ... + 121745306.

It is an arithmetic number, because the mean of its divisors is an integer number (163613735040).

Almost surely, 2^{2166177670643} is an apocalyptic number.

2166177670643 is a deficient number, since it is larger than the sum of its proper divisors (451642089997).

2166177670643 is a wasteful number, since it uses less digits than its factorization.

2166177670643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243472898.

The product of its (nonzero) digits is 10668672, while the sum is 56.

The spelling of 2166177670643 in words is "two trillion, one hundred sixty-six billion, one hundred seventy-seven million, six hundred seventy thousand, six hundred forty-three".