25735650671557 has 2 divisors, whose sum is σ = 25735650671558. Its totient is φ = 25735650671556.

The previous prime is 25735650671551. The next prime is 25735650671561. The reversal of 25735650671557 is 75517605653752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24485069201121 + 1250581470436 = 4948239^2 + 1118294^2 .

It is a cyclic number.

It is not a de Polignac number, because 25735650671557 - 2⁷ = 25735650671429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25735650671551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12867825335778 + 12867825335779.

It is an arithmetic number, because the mean of its divisors is an integer number (12867825335779).

Almost surely, 2^{25735650671557} is an apocalyptic number.

It is an amenable number.

25735650671557 is a deficient number, since it is larger than the sum of its proper divisors (1).

25735650671557 is an equidigital number, since it uses as much as digits as its factorization.

25735650671557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 231525000, while the sum is 64.

The spelling of 25735650671557 in words is "twenty-five trillion, seven hundred thirty-five billion, six hundred fifty million, six hundred seventy-one thousand, five hundred fifty-seven".