25538778875 has 16 divisors (see below), whose sum is σ = 32067957792. Its totient is φ = 20305663200.

The previous prime is 25538778823. The next prime is 25538778877. The reversal of 25538778875 is 57887783552.

It is not a de Polignac number, because 25538778875 - 2⁸ = 25538778619 is a prime.

It is a super-2 number, since 2×25538778875² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25538778877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 606344 + ... + 647093.

It is an arithmetic number, because the mean of its divisors is an integer number (2004247362).

Almost surely, 2^25538778875 is an apocalyptic number.

25538778875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25538778875 is a deficient number, since it is larger than the sum of its proper divisors (6529178917).

25538778875 is a wasteful number, since it uses less digits than its factorization.

25538778875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253615 (or 1253605 counting only the distinct ones).

The product of its digits is 131712000, while the sum is 65.

The spelling of 25538778875 in words is "twenty-five billion, five hundred thirty-eight million, seven hundred seventy-eight thousand, eight hundred seventy-five".