25715577109 has 2 divisors, whose sum is σ = 25715577110. Its totient is φ = 25715577108.

The previous prime is 25715577079. The next prime is 25715577137. The reversal of 25715577109 is 90177551752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19874796484 + 5840780625 = 140978^2 + 76425^2 .

It is a cyclic number.

It is not a de Polignac number, because 25715577109 - 2¹³ = 25715568917 is a prime.

It is a super-2 number, since 2×25715577109² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25715574109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12857788554 + 12857788555.

It is an arithmetic number, because the mean of its divisors is an integer number (12857788555).

Almost surely, 2^25715577109 is an apocalyptic number.

It is an amenable number.

25715577109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25715577109 is an equidigital number, since it uses as much as digits as its factorization.

25715577109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 771750, while the sum is 49.

The spelling of 25715577109 in words is "twenty-five billion, seven hundred fifteen million, five hundred seventy-seven thousand, one hundred nine".