25440025340020 has 12 divisors (see below), whose sum is σ = 53424053214084. Its totient is φ = 10176010136000.

The previous prime is 25440025339961. The next prime is 25440025340027. The reversal of 25440025340020 is 2004352004452.

It can be written as a sum of positive squares in 2 ways, for example, as 18346933022224 + 7093092317796 = 4283332^2 + 2663286^2 .

It is a super-2 number, since 2×25440025340020² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25440025340027) 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, 636000633481 + ... + 636000633520.

It is an arithmetic number, because the mean of its divisors is an integer number (4452004434507).

Almost surely, 2^{25440025340020} is an apocalyptic number.

25440025340020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25440025340020 is an abundant number, since it is smaller than the sum of its proper divisors (27984027874064).

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

25440025340020 is a wasteful number, since it uses less digits than its factorization.

25440025340020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272001267010 (or 1272001267008 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 31.

Adding to 25440025340020 its reverse (2004352004452), we get a palindrome (27444377344472).

The spelling of 25440025340020 in words is "twenty-five trillion, four hundred forty billion, twenty-five million, three hundred forty thousand, twenty".