25425305220520 has 16 divisors (see below), whose sum is σ = 57206936746260. Its totient is φ = 10170122088192.

The previous prime is 25425305220509. The next prime is 25425305220527. The reversal of 25425305220520 is 2502250352452.

It can be written as a sum of positive squares in 2 ways, for example, as 23160214000036 + 2265091220484 = 4812506^2 + 1505022^2 .

It is a super-2 number, since 2×25425305220520² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25425305220520.

It is not an unprimeable number, because it can be changed into a prime (25425305220527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317816315217 + ... + 317816315296.

Almost surely, 2^{25425305220520} is an apocalyptic number.

25425305220520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25425305220520 is an abundant number, since it is smaller than the sum of its proper divisors (31781631525740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25425305220520 is a wasteful number, since it uses less digits than its factorization.

25425305220520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635632630524 (or 635632630520 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 37.

Adding to 25425305220520 its reverse (2502250352452), we get a palindrome (27927555572972).

The spelling of 25425305220520 in words is "twenty-five trillion, four hundred twenty-five billion, three hundred five million, two hundred twenty thousand, five hundred twenty".