25782778258 has 8 divisors (see below), whose sum is σ = 38678103180. Its totient is φ = 12890077200.

The previous prime is 25782778253. The next prime is 25782778261. The reversal of 25782778258 is 85287728752.

It can be written as a sum of positive squares in 2 ways, for example, as 25780476969 + 2301289 = 160563^2 + 1517^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 25782778196 and 25782778205.

It is not an unprimeable number, because it can be changed into a prime (25782778253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631213 + ... + 670816.

Almost surely, 2^25782778258 is an apocalyptic number.

25782778258 is a deficient number, since it is larger than the sum of its proper divisors (12895324922).

25782778258 is a wasteful number, since it uses less digits than its factorization.

25782778258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311932.

The product of its digits is 35123200, while the sum is 61.

The spelling of 25782778258 in words is "twenty-five billion, seven hundred eighty-two million, seven hundred seventy-eight thousand, two hundred fifty-eight".