25830657221 has 2 divisors, whose sum is σ = 25830657222. Its totient is φ = 25830657220.

The previous prime is 25830657211. The next prime is 25830657239. The reversal of 25830657221 is 12275603852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25758645025 + 72012196 = 160495^2 + 8486^2 .

It is a cyclic number.

It is not a de Polignac number, because 25830657221 - 2¹⁸ = 25830395077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25830657211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12915328610 + 12915328611.

It is an arithmetic number, because the mean of its divisors is an integer number (12915328611).

Almost surely, 2^25830657221 is an apocalyptic number.

It is an amenable number.

25830657221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25830657221 is an equidigital number, since it uses as much as digits as its factorization.

25830657221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 25830657221 in words is "twenty-five billion, eight hundred thirty million, six hundred fifty-seven thousand, two hundred twenty-one".