25515318068 has 6 divisors (see below), whose sum is σ = 44651806626. Its totient is φ = 12757659032.

The previous prime is 25515318047. The next prime is 25515318079. The reversal of 25515318068 is 86081351552.

It can be written as a sum of positive squares in only one way, i.e., 25007627044 + 507691024 = 158138^2 + 22532^2 .

It is a super-2 number, since 2×25515318068² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 3189414755 + ... + 3189414762.

It is an arithmetic number, because the mean of its divisors is an integer number (7441967771).

Almost surely, 2^25515318068 is an apocalyptic number.

It is an amenable number.

25515318068 is a deficient number, since it is larger than the sum of its proper divisors (19136488558).

25515318068 is a wasteful number, since it uses less digits than its factorization.

25515318068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6378829521 (or 6378829519 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 44.

The spelling of 25515318068 in words is "twenty-five billion, five hundred fifteen million, three hundred eighteen thousand, sixty-eight".