25676280821 has 2 divisors, whose sum is σ = 25676280822. Its totient is φ = 25676280820.

The previous prime is 25676280811. The next prime is 25676280853. The reversal of 25676280821 is 12808267652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24598471921 + 1077808900 = 156839^2 + 32830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25676280821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25676280811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12838140410 + 12838140411.

It is an arithmetic number, because the mean of its divisors is an integer number (12838140411).

Almost surely, 2^25676280821 is an apocalyptic number.

It is an amenable number.

25676280821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25676280821 is an equidigital number, since it uses as much as digits as its factorization.

25676280821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 25676280821 in words is "twenty-five billion, six hundred seventy-six million, two hundred eighty thousand, eight hundred twenty-one".