2405642761 has 2 divisors, whose sum is σ = 2405642762. Its totient is φ = 2405642760.

The previous prime is 2405642747. The next prime is 2405642773. The reversal of 2405642761 is 1672465042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1306388736 + 1099254025 = 36144^2 + 33155^2 .

It is a cyclic number.

It is not a de Polignac number, because 2405642761 - 2²⁷ = 2271425033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2405642761.

It is not a weakly prime, because it can be changed into another prime (2405642711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1202821380 + 1202821381.

It is an arithmetic number, because the mean of its divisors is an integer number (1202821381).

Almost surely, 2^2405642761 is an apocalyptic number.

It is an amenable number.

2405642761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2405642761 is an equidigital number, since it uses as much as digits as its factorization.

2405642761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 2405642761 is about 49047.3522323071. The cubic root of 2405642761 is about 1339.9143705956.

The spelling of 2405642761 in words is "two billion, four hundred five million, six hundred forty-two thousand, seven hundred sixty-one".