25338512578 has 4 divisors (see below), whose sum is σ = 38007768870. Its totient is φ = 12669256288.

The previous prime is 25338512561. The next prime is 25338512581. The reversal of 25338512578 is 87521583352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17490856009 + 7847656569 = 132253^2 + 88587^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6334628143 + ... + 6334628146.

Almost surely, 2^25338512578 is an apocalyptic number.

25338512578 is a deficient number, since it is larger than the sum of its proper divisors (12669256292).

25338512578 is a wasteful number, since it uses less digits than its factorization.

25338512578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12669256291.

The product of its digits is 2016000, while the sum is 49.

The spelling of 25338512578 in words is "twenty-five billion, three hundred thirty-eight million, five hundred twelve thousand, five hundred seventy-eight".