2166281286629 has 2 divisors, whose sum is σ = 2166281286630. Its totient is φ = 2166281286628.

The previous prime is 2166281286623. The next prime is 2166281286691. The reversal of 2166281286629 is 9266821826612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1586554372225 + 579726914404 = 1259585^2 + 761398^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166281286629 - 2⁸ = 2166281286373 is a prime.

It is a super-2 number, since 2×2166281286629² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166281286623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083140643314 + 1083140643315.

It is an arithmetic number, because the mean of its divisors is an integer number (1083140643315).

Almost surely, 2^{2166281286629} is an apocalyptic number.

It is an amenable number.

2166281286629 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166281286629 is an equidigital number, since it uses as much as digits as its factorization.

2166281286629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11943936, while the sum is 59.

The spelling of 2166281286629 in words is "two trillion, one hundred sixty-six billion, two hundred eighty-one million, two hundred eighty-six thousand, six hundred twenty-nine".