2166967539449 has 2 divisors, whose sum is σ = 2166967539450. Its totient is φ = 2166967539448.

The previous prime is 2166967539389. The next prime is 2166967539469. The reversal of 2166967539449 is 9449357696612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2085517233424 + 81450306025 = 1444132^2 + 285395^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166967539449 - 2¹² = 2166967535353 is a prime.

It is not a weakly prime, because it can be changed into another prime (2166967539469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083483769724 + 1083483769725.

It is an arithmetic number, because the mean of its divisors is an integer number (1083483769725).

Almost surely, 2^{2166967539449} is an apocalyptic number.

It is an amenable number.

2166967539449 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166967539449 is an equidigital number, since it uses as much as digits as its factorization.

2166967539449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529079040, while the sum is 71.

The spelling of 2166967539449 in words is "two trillion, one hundred sixty-six billion, nine hundred sixty-seven million, five hundred thirty-nine thousand, four hundred forty-nine".