2636478461 has 2 divisors, whose sum is σ = 2636478462. Its totient is φ = 2636478460.

The previous prime is 2636478457. The next prime is 2636478487. The reversal of 2636478461 is 1648746362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1977580900 + 658897561 = 44470^2 + 25669^2 .

It is a cyclic number.

It is not a de Polignac number, because 2636478461 - 2² = 2636478457 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2636478451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318239230 + 1318239231.

It is an arithmetic number, because the mean of its divisors is an integer number (1318239231).

Almost surely, 2^2636478461 is an apocalyptic number.

It is an amenable number.

2636478461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2636478461 is an equidigital number, since it uses as much as digits as its factorization.

2636478461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 47.

The square root of 2636478461 is about 51346.6499491447. The cubic root of 2636478461 is about 1381.4698441496.

The spelling of 2636478461 in words is "two billion, six hundred thirty-six million, four hundred seventy-eight thousand, four hundred sixty-one".