2166021607 has 2 divisors, whose sum is σ = 2166021608. Its totient is φ = 2166021606.

The previous prime is 2166021601. The next prime is 2166021623. The reversal of 2166021607 is 7061206612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166021607 - 2⁷ = 2166021479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166021601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083010803 + 1083010804.

It is an arithmetic number, because the mean of its divisors is an integer number (1083010804).

Almost surely, 2^2166021607 is an apocalyptic number.

2166021607 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166021607 is an equidigital number, since it uses as much as digits as its factorization.

2166021607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 2166021607 is about 46540.5372444281. The cubic root of 2166021607 is about 1293.8609179270.

The spelling of 2166021607 in words is "two billion, one hundred sixty-six million, twenty-one thousand, six hundred seven".