25671173517881 has 2 divisors, whose sum is σ = 25671173517882. Its totient is φ = 25671173517880.

The previous prime is 25671173517853. The next prime is 25671173517893. The reversal of 25671173517881 is 18871537117652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14996682228025 + 10674491289856 = 3872555^2 + 3267184^2 .

It is a cyclic number.

It is not a de Polignac number, because 25671173517881 - 2¹⁸ = 25671173255737 is a prime.

It is a super-3 number, since 3×25671173517881³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (25671173517581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12835586758940 + 12835586758941.

It is an arithmetic number, because the mean of its divisors is an integer number (12835586758941).

Almost surely, 2^{25671173517881} is an apocalyptic number.

It is an amenable number.

25671173517881 is a deficient number, since it is larger than the sum of its proper divisors (1).

25671173517881 is an equidigital number, since it uses as much as digits as its factorization.

25671173517881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19756800, while the sum is 62.

The spelling of 25671173517881 in words is "twenty-five trillion, six hundred seventy-one billion, one hundred seventy-three million, five hundred seventeen thousand, eight hundred eighty-one".