6216167561 has 2 divisors, whose sum is σ = 6216167562. Its totient is φ = 6216167560.

The previous prime is 6216167549. The next prime is 6216167579. The reversal of 6216167561 is 1657616126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6045995536 + 170172025 = 77756^2 + 13045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6216167561 is a prime.

It is not a weakly prime, because it can be changed into another prime (6216167261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3108083780 + 3108083781.

It is an arithmetic number, because the mean of its divisors is an integer number (3108083781).

Almost surely, 2^6216167561 is an apocalyptic number.

It is an amenable number.

6216167561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6216167561 is an equidigital number, since it uses as much as digits as its factorization.

6216167561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 6216167561 is about 78842.6760136920. The cubic root of 6216167561 is about 1838.6860066710.

The spelling of 6216167561 in words is "six billion, two hundred sixteen million, one hundred sixty-seven thousand, five hundred sixty-one".