25128408242 has 12 divisors (see below), whose sum is σ = 43846508430. Its totient is φ = 10769317776.

The previous prime is 25128408211. The next prime is 25128408289. The reversal of 25128408242 is 24280482152.

It can be written as a sum of positive squares in only one way, i.e., 14745002041 + 10383406201 = 121429^2 + 101899^2 .

It is a super-3 number, since 3×25128408242³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 25128408196 and 25128408205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128206067 + ... + 128206262.

Almost surely, 2^25128408242 is an apocalyptic number.

25128408242 is a deficient number, since it is larger than the sum of its proper divisors (18718100188).

25128408242 is a wasteful number, since it uses less digits than its factorization.

25128408242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256412345 (or 256412338 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 38.

The spelling of 25128408242 in words is "twenty-five billion, one hundred twenty-eight million, four hundred eight thousand, two hundred forty-two".