25131012545 has 4 divisors (see below), whose sum is σ = 30157215060. Its totient is φ = 20104810032.

The previous prime is 25131012523. The next prime is 25131012551. The reversal of 25131012545 is 54521013152.

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 11476622641 + 13654389904 = 107129^2 + 116852^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25131012545 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2513101250 + ... + 2513101259.

It is an arithmetic number, because the mean of its divisors is an integer number (7539303765).

Almost surely, 2^25131012545 is an apocalyptic number.

It is an amenable number.

25131012545 is a deficient number, since it is larger than the sum of its proper divisors (5026202515).

25131012545 is an equidigital number, since it uses as much as digits as its factorization.

25131012545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5026202514.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 25131012545 its reverse (54521013152), we get a palindrome (79652025697).

The spelling of 25131012545 in words is "twenty-five billion, one hundred thirty-one million, twelve thousand, five hundred forty-five".