25515013042 has 8 divisors (see below), whose sum is σ = 38277625500. Its totient is φ = 12755804544.

The previous prime is 25515013021. The next prime is 25515013049. The reversal of 25515013042 is 24031051552.

It can be written as a sum of positive squares in 2 ways, for example, as 24460647201 + 1054365841 = 156399^2 + 32471^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25515013042.

It is not an unprimeable number, because it can be changed into a prime (25515013049) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 832167 + ... + 862282.

Almost surely, 2^25515013042 is an apocalyptic number.

25515013042 is a deficient number, since it is larger than the sum of its proper divisors (12762612458).

25515013042 is a wasteful number, since it uses less digits than its factorization.

25515013042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701980.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 25515013042 its reverse (24031051552), we get a palindrome (49546064594).

The spelling of 25515013042 in words is "twenty-five billion, five hundred fifteen million, thirteen thousand, forty-two".