25681511487375 has 80 divisors (see below), whose sum is σ = 47900993231520. Its totient is φ = 13690213056000.

The previous prime is 25681511487371. The next prime is 25681511487377. The reversal of 25681511487375 is 57378411518652.

25681511487375 is a `hidden beast` number, since 2 + 5 + 6 + 8 + 1 + 511 + 4 + 87 + 37 + 5 = 666.

It is not a de Polignac number, because 25681511487375 - 2² = 25681511487371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25681511487371) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 20460696 + ... + 21679554.

It is an arithmetic number, because the mean of its divisors is an integer number (598762415394).

Almost surely, 2^{25681511487375} is an apocalyptic number.

25681511487375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25681511487375 is a deficient number, since it is larger than the sum of its proper divisors (22219481744145).

25681511487375 is a wasteful number, since it uses less digits than its factorization.

25681511487375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220967 (or 1220948 counting only the distinct ones).

The product of its digits is 56448000, while the sum is 63.

The spelling of 25681511487375 in words is "twenty-five trillion, six hundred eighty-one billion, five hundred eleven million, four hundred eighty-seven thousand, three hundred seventy-five".