25500085691 has 2 divisors, whose sum is σ = 25500085692. Its totient is φ = 25500085690.

The previous prime is 25500085643. The next prime is 25500085747. The reversal of 25500085691 is 19658000552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25500085691 - 2¹⁰ = 25500084667 is a prime.

It is not a weakly prime, because it can be changed into another prime (25500085291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12750042845 + 12750042846.

It is an arithmetic number, because the mean of its divisors is an integer number (12750042846).

Almost surely, 2^25500085691 is an apocalyptic number.

25500085691 is a deficient number, since it is larger than the sum of its proper divisors (1).

25500085691 is an equidigital number, since it uses as much as digits as its factorization.

25500085691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 25500085691 in words is "twenty-five billion, five hundred million, eighty-five thousand, six hundred ninety-one".