25454144513 has 24 divisors (see below), whose sum is σ = 30525692904. Its totient is φ = 21149856000.

The previous prime is 25454144497. The next prime is 25454144539. The reversal of 25454144513 is 31544145452.

It can be written as a sum of positive squares in 4 ways, for example, as 424689664 + 25029454849 = 20608^2 + 158207^2 .

It is not a de Polignac number, because 25454144513 - 2⁴ = 25454144497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25454144543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 275063 + ... + 355763.

It is an arithmetic number, because the mean of its divisors is an integer number (1271903871).

Almost surely, 2^25454144513 is an apocalyptic number.

It is an amenable number.

25454144513 is a deficient number, since it is larger than the sum of its proper divisors (5071548391).

25454144513 is a wasteful number, since it uses less digits than its factorization.

25454144513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80913 (or 80906 counting only the distinct ones).

The product of its digits is 192000, while the sum is 38.

Adding to 25454144513 its reverse (31544145452), we get a palindrome (56998289965).

The spelling of 25454144513 in words is "twenty-five billion, four hundred fifty-four million, one hundred forty-four thousand, five hundred thirteen".