2166715877 has 2 divisors, whose sum is σ = 2166715878. Its totient is φ = 2166715876.

The previous prime is 2166715813. The next prime is 2166715921. The reversal of 2166715877 is 7785176612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2166530116 + 185761 = 46546^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166715877 - 2⁶ = 2166715813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166715277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083357938 + 1083357939.

It is an arithmetic number, because the mean of its divisors is an integer number (1083357939).

Almost surely, 2^2166715877 is an apocalyptic number.

It is an amenable number.

2166715877 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166715877 is an equidigital number, since it uses as much as digits as its factorization.

2166715877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 50.

The square root of 2166715877 is about 46547.9954133365. The cubic root of 2166715877 is about 1293.9991425963. Note that the first 3 decimals are identical.

The spelling of 2166715877 in words is "two billion, one hundred sixty-six million, seven hundred fifteen thousand, eight hundred seventy-seven".