25666712171023 has 16 divisors (see below), whose sum is σ = 32002672078080. Its totient is φ = 19998400867200.

The previous prime is 25666712170921. The next prime is 25666712171047. The reversal of 25666712171023 is 32017121766652.

It is not a de Polignac number, because 25666712171023 - 2³⁷ = 25529273217551 is a prime.

It is a super-2 number, since 2×25666712171023² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25666712171053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12672913 + ... + 14558026.

It is an arithmetic number, because the mean of its divisors is an integer number (2000167004880).

Almost surely, 2^{25666712171023} is an apocalyptic number.

25666712171023 is a deficient number, since it is larger than the sum of its proper divisors (6335959907057).

25666712171023 is a wasteful number, since it uses less digits than its factorization.

25666712171023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27243198.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 25666712171023 in words is "twenty-five trillion, six hundred sixty-six billion, seven hundred twelve million, one hundred seventy-one thousand, twenty-three".