25440421205444 has 48 divisors (see below), whose sum is σ = 52638943418880. Its totient is φ = 10526353004160.

The previous prime is 25440421205443. The next prime is 25440421205477. The reversal of 25440421205444 is 44450212404452.

It is a super-2 number, since 2×25440421205444² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25440421205443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10929974 + ... + 13051634.

It is an arithmetic number, because the mean of its divisors is an integer number (1096644654560).

Almost surely, 2^{25440421205444} is an apocalyptic number.

It is an amenable number.

25440421205444 is an abundant number, since it is smaller than the sum of its proper divisors (27198522213436).

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

25440421205444 is a wasteful number, since it uses less digits than its factorization.

25440421205444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136468 (or 2136466 counting only the distinct ones).

The product of its (nonzero) digits is 819200, while the sum is 41.

Adding to 25440421205444 its reverse (44450212404452), we get a palindrome (69890633609896).

The spelling of 25440421205444 in words is "twenty-five trillion, four hundred forty billion, four hundred twenty-one million, two hundred five thousand, four hundred forty-four".