25458997888 has 64 divisors (see below), whose sum is σ = 53360775720. Its totient is φ = 12083281920.

The previous prime is 25458997867. The next prime is 25458997897. The reversal of 25458997888 is 88879985452.

It can be written as a sum of positive squares in 4 ways, for example, as 17022942784 + 8436055104 = 130472^2 + 91848^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×25458997888² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25458997888.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128620 + ... + 259732.

Almost surely, 2^25458997888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25458997888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26680387860).

25458997888 is an abundant number, since it is smaller than the sum of its proper divisors (27901777832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25458997888 is a wasteful number, since it uses less digits than its factorization.

25458997888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131205 (or 131193 counting only the distinct ones).

The product of its digits is 464486400, while the sum is 73.

The spelling of 25458997888 in words is "twenty-five billion, four hundred fifty-eight million, nine hundred ninety-seven thousand, eight hundred eighty-eight".