25567725434 has 4 divisors (see below), whose sum is σ = 38351588154. Its totient is φ = 12783862716.

The previous prime is 25567725431. The next prime is 25567725457. The reversal of 25567725434 is 43452776552.

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., 23273028025 + 2294697409 = 152555^2 + 47903^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25567725431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6391931357 + ... + 6391931360.

Almost surely, 2^25567725434 is an apocalyptic number.

25567725434 is a deficient number, since it is larger than the sum of its proper divisors (12783862720).

25567725434 is a wasteful number, since it uses less digits than its factorization.

25567725434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12783862719.

The product of its digits is 7056000, while the sum is 50.

The spelling of 25567725434 in words is "twenty-five billion, five hundred sixty-seven million, seven hundred twenty-five thousand, four hundred thirty-four".