25654242545 has 4 divisors (see below), whose sum is σ = 30785091060. Its totient is φ = 20523394032.

The previous prime is 25654242539. The next prime is 25654242563. The reversal of 25654242545 is 54524245652.

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 18340743184 + 7313499361 = 135428^2 + 85519^2 .

It is a cyclic number.

It is not a de Polignac number, because 25654242545 - 2¹⁶ = 25654177009 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25654242496 and 25654242505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565424250 + ... + 2565424259.

It is an arithmetic number, because the mean of its divisors is an integer number (7696272765).

Almost surely, 2^25654242545 is an apocalyptic number.

It is an amenable number.

25654242545 is a deficient number, since it is larger than the sum of its proper divisors (5130848515).

25654242545 is an equidigital number, since it uses as much as digits as its factorization.

25654242545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130848514.

The product of its digits is 1920000, while the sum is 44.

The spelling of 25654242545 in words is "twenty-five billion, six hundred fifty-four million, two hundred forty-two thousand, five hundred forty-five".