2166512316466 has 4 divisors (see below), whose sum is σ = 3249768474702. Its totient is φ = 1083256158232.

The previous prime is 2166512316461. The next prime is 2166512316491. The reversal of 2166512316466 is 6646132156612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1285908372441 + 880603944025 = 1133979^2 + 938405^2 .

It is a Smith number, since the sum of its digits (49) 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 (2166512316461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541628079115 + ... + 541628079118.

Almost surely, 2^{2166512316466} is an apocalyptic number.

2166512316466 is a deficient number, since it is larger than the sum of its proper divisors (1083256158236).

2166512316466 is a wasteful number, since it uses less digits than its factorization.

2166512316466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083256158235.

The product of its digits is 1866240, while the sum is 49.

The spelling of 2166512316466 in words is "two trillion, one hundred sixty-six billion, five hundred twelve million, three hundred sixteen thousand, four hundred sixty-six".