25284816145 has 4 divisors (see below), whose sum is σ = 30341779380. Its totient is φ = 20227852912.

The previous prime is 25284816127. The next prime is 25284816149. The reversal of 25284816145 is 54161848252.

It is a Cunningham number, because it is equal to 159012²+1.

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 9102686464 + 16182129681 = 95408^2 + 127209^2 .

It is a cyclic number.

It is not a de Polignac number, because 25284816145 - 2⁷ = 25284816017 is a prime.

It is a super-2 number, since 2×25284816145² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25284816095 and 25284816104.

It is not an unprimeable number, because it can be changed into a prime (25284816149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2528481610 + ... + 2528481619.

It is an arithmetic number, because the mean of its divisors is an integer number (7585444845).

Almost surely, 2^25284816145 is an apocalyptic number.

It is an amenable number.

25284816145 is a deficient number, since it is larger than the sum of its proper divisors (5056963235).

25284816145 is an equidigital number, since it uses as much as digits as its factorization.

25284816145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5056963234.

The product of its digits is 614400, while the sum is 46.

It can be divided in two parts, 2528481 and 6145, that added together give a triangular number (2534626 = T₂₂₅₁).

The spelling of 25284816145 in words is "twenty-five billion, two hundred eighty-four million, eight hundred sixteen thousand, one hundred forty-five".