25698486721 has 2 divisors, whose sum is σ = 25698486722. Its totient is φ = 25698486720.

The previous prime is 25698486673. The next prime is 25698486739. The reversal of 25698486721 is 12768489652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21432960000 + 4265526721 = 146400^2 + 65311^2 .

It is a cyclic number.

It is not a de Polignac number, because 25698486721 - 2¹³ = 25698478529 is a prime.

It is not a weakly prime, because it can be changed into another prime (25698486221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12849243360 + 12849243361.

It is an arithmetic number, because the mean of its divisors is an integer number (12849243361).

Almost surely, 2^25698486721 is an apocalyptic number.

It is an amenable number.

25698486721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25698486721 is an equidigital number, since it uses as much as digits as its factorization.

25698486721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11612160, while the sum is 58.

The spelling of 25698486721 in words is "twenty-five billion, six hundred ninety-eight million, four hundred eighty-six thousand, seven hundred twenty-one".