25625416561 has 2 divisors, whose sum is σ = 25625416562. Its totient is φ = 25625416560.

The previous prime is 25625416549. The next prime is 25625416567. The reversal of 25625416561 is 16561452652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22885940961 + 2739475600 = 151281^2 + 52340^2 .

It is a cyclic number.

It is not a de Polignac number, because 25625416561 - 2⁹ = 25625416049 is a prime.

It is not a weakly prime, because it can be changed into another prime (25625416567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12812708280 + 12812708281.

It is an arithmetic number, because the mean of its divisors is an integer number (12812708281).

Almost surely, 2^25625416561 is an apocalyptic number.

It is an amenable number.

25625416561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25625416561 is an equidigital number, since it uses as much as digits as its factorization.

25625416561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 43.

The spelling of 25625416561 in words is "twenty-five billion, six hundred twenty-five million, four hundred sixteen thousand, five hundred sixty-one".