2167876561 has 2 divisors, whose sum is σ = 2167876562. Its totient is φ = 2167876560.

The previous prime is 2167876541. The next prime is 2167876577. The reversal of 2167876561 is 1656787612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2139987600 + 27888961 = 46260^2 + 5281^2 .

It is a cyclic number.

It is not a de Polignac number, because 2167876561 - 2⁹ = 2167876049 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2167876541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083938280 + 1083938281.

It is an arithmetic number, because the mean of its divisors is an integer number (1083938281).

Almost surely, 2^2167876561 is an apocalyptic number.

It is an amenable number.

2167876561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2167876561 is an equidigital number, since it uses as much as digits as its factorization.

2167876561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 49.

The square root of 2167876561 is about 46560.4613486593. The cubic root of 2167876561 is about 1294.2301613482.

The spelling of 2167876561 in words is "two billion, one hundred sixty-seven million, eight hundred seventy-six thousand, five hundred sixty-one".