25650471961 has 2 divisors, whose sum is σ = 25650471962. Its totient is φ = 25650471960.

The previous prime is 25650471901. The next prime is 25650471991. The reversal of 25650471961 is 16917405652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20490204736 + 5160267225 = 143144^2 + 71835^2 .

It is a cyclic number.

It is not a de Polignac number, because 25650471961 - 2²¹ = 25648374809 is a prime.

It is not a weakly prime, because it can be changed into another prime (25650471901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12825235980 + 12825235981.

It is an arithmetic number, because the mean of its divisors is an integer number (12825235981).

Almost surely, 2^25650471961 is an apocalyptic number.

It is an amenable number.

25650471961 is a deficient number, since it is larger than the sum of its proper divisors (1).

25650471961 is an equidigital number, since it uses as much as digits as its factorization.

25650471961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 25650471961 in words is "twenty-five billion, six hundred fifty million, four hundred seventy-one thousand, nine hundred sixty-one".