25356131645 has 8 divisors (see below), whose sum is σ = 32767924056. Its totient is φ = 18724527936.

The previous prime is 25356131621. The next prime is 25356131657. The reversal of 25356131645 is 54613165352.

It can be written as a sum of positive squares in 4 ways, for example, as 70997476 + 25285134169 = 8426^2 + 159013^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25356131645 - 2¹⁴ = 25356115261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195047102 + ... + 195047231.

It is an arithmetic number, because the mean of its divisors is an integer number (4095990507).

Almost surely, 2^25356131645 is an apocalyptic number.

It is an amenable number.

25356131645 is a deficient number, since it is larger than the sum of its proper divisors (7411792411).

25356131645 is a wasteful number, since it uses less digits than its factorization.

25356131645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390094351.

The product of its digits is 324000, while the sum is 41.

Adding to 25356131645 its reverse (54613165352), we get a palindrome (79969296997).

The spelling of 25356131645 in words is "twenty-five billion, three hundred fifty-six million, one hundred thirty-one thousand, six hundred forty-five".