25390134557 has 4 divisors (see below), whose sum is σ = 25392068796. Its totient is φ = 25388200320.

The previous prime is 25390134547. The next prime is 25390134613. The reversal of 25390134557 is 75543109352.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20706922201 + 4683212356 = 143899^2 + 68434^2 .

It is a cyclic number.

It is not a de Polignac number, because 25390134557 - 2¹⁰ = 25390133533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25390134547) 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, 947294 + ... + 973727.

It is an arithmetic number, because the mean of its divisors is an integer number (6348017199).

Almost surely, 2^25390134557 is an apocalyptic number.

It is an amenable number.

25390134557 is a deficient number, since it is larger than the sum of its proper divisors (1934239).

25390134557 is a wasteful number, since it uses less digits than its factorization.

25390134557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934238.

The product of its (nonzero) digits is 567000, while the sum is 44.

The spelling of 25390134557 in words is "twenty-five billion, three hundred ninety million, one hundred thirty-four thousand, five hundred fifty-seven".