25512031345 has 4 divisors (see below), whose sum is σ = 30614437620. Its totient is φ = 20409625072.

The previous prime is 25512031301. The next prime is 25512031387. The reversal of 25512031345 is 54313021552.

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 10462630369 + 15049400976 = 102287^2 + 122676^2 .

It is a cyclic number.

It is not a de Polignac number, because 25512031345 - 2¹³ = 25512023153 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2551203130 + ... + 2551203139.

It is an arithmetic number, because the mean of its divisors is an integer number (7653609405).

Almost surely, 2^25512031345 is an apocalyptic number.

It is an amenable number.

25512031345 is a deficient number, since it is larger than the sum of its proper divisors (5102406275).

25512031345 is an equidigital number, since it uses as much as digits as its factorization.

25512031345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102406274.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 25512031345 its reverse (54313021552), we get a palindrome (79825052897).

The spelling of 25512031345 in words is "twenty-five billion, five hundred twelve million, thirty-one thousand, three hundred forty-five".