25650684221 has 2 divisors, whose sum is σ = 25650684222. Its totient is φ = 25650684220.

The previous prime is 25650684187. The next prime is 25650684313. The reversal of 25650684221 is 12248605652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16387584196 + 9263100025 = 128014^2 + 96245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25650684221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25650689221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12825342110 + 12825342111.

It is an arithmetic number, because the mean of its divisors is an integer number (12825342111).

Almost surely, 2^25650684221 is an apocalyptic number.

It is an amenable number.

25650684221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25650684221 is an equidigital number, since it uses as much as digits as its factorization.

25650684221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 25650684221 in words is "twenty-five billion, six hundred fifty million, six hundred eighty-four thousand, two hundred twenty-one".