2167678657 has 2 divisors, whose sum is σ = 2167678658. Its totient is φ = 2167678656.

The previous prime is 2167678649. The next prime is 2167678663. The reversal of 2167678657 is 7568767612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1375593921 + 792084736 = 37089^2 + 28144^2 .

It is a cyclic number.

It is not a de Polignac number, because 2167678657 - 2³ = 2167678649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2167678598 and 2167678607.

It is not a weakly prime, because it can be changed into another prime (2167678607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083839328 + 1083839329.

It is an arithmetic number, because the mean of its divisors is an integer number (1083839329).

Almost surely, 2^2167678657 is an apocalyptic number.

It is an amenable number.

2167678657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2167678657 is an equidigital number, since it uses as much as digits as its factorization.

2167678657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5927040, while the sum is 55.

The square root of 2167678657 is about 46558.3360634806. The cubic root of 2167678657 is about 1294.1907770147.

The spelling of 2167678657 in words is "two billion, one hundred sixty-seven million, six hundred seventy-eight thousand, six hundred fifty-seven".