2649767761 has 2 divisors, whose sum is σ = 2649767762. Its totient is φ = 2649767760.

The previous prime is 2649767753. The next prime is 2649767773. The reversal of 2649767761 is 1677679462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2437890625 + 211877136 = 49375^2 + 14556^2 .

It is a cyclic number.

It is not a de Polignac number, because 2649767761 - 2³ = 2649767753 is a prime.

It is not a weakly prime, because it can be changed into another prime (2649767711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1324883880 + 1324883881.

It is an arithmetic number, because the mean of its divisors is an integer number (1324883881).

Almost surely, 2^2649767761 is an apocalyptic number.

It is an amenable number.

2649767761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2649767761 is an equidigital number, since it uses as much as digits as its factorization.

2649767761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5334336, while the sum is 55.

The square root of 2649767761 is about 51475.8949509380. The cubic root of 2649767761 is about 1383.7870774678.

The spelling of 2649767761 in words is "two billion, six hundred forty-nine million, seven hundred sixty-seven thousand, seven hundred sixty-one".