6556745761 has 2 divisors, whose sum is σ = 6556745762. Its totient is φ = 6556745760.

The previous prime is 6556745753. The next prime is 6556745773. The reversal of 6556745761 is 1675476556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6297374736 + 259371025 = 79356^2 + 16105^2 .

It is a cyclic number.

It is not a de Polignac number, because 6556745761 - 2³ = 6556745753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6556745699 and 6556745708.

It is not a weakly prime, because it can be changed into another prime (6556745711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3278372880 + 3278372881.

It is an arithmetic number, because the mean of its divisors is an integer number (3278372881).

Almost surely, 2^6556745761 is an apocalyptic number.

It is an amenable number.

6556745761 is a deficient number, since it is larger than the sum of its proper divisors (1).

6556745761 is an equidigital number, since it uses as much as digits as its factorization.

6556745761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292000, while the sum is 52.

The square root of 6556745761 is about 80973.7350070997. The cubic root of 6556745761 is about 1871.6707271183.

The spelling of 6556745761 in words is "six billion, five hundred fifty-six million, seven hundred forty-five thousand, seven hundred sixty-one".