25621053136 has 80 divisors (see below), whose sum is σ = 59371628544. Its totient is φ = 10472406912.

The previous prime is 25621053127. The next prime is 25621053137. The reversal of 25621053136 is 63135012652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25621053137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 879541 + ... + 908203.

Almost surely, 2^25621053136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25621053136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29685814272).

25621053136 is an abundant number, since it is smaller than the sum of its proper divisors (33750575408).

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

25621053136 is a wasteful number, since it uses less digits than its factorization.

25621053136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29048 (or 29042 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

Adding to 25621053136 its reverse (63135012652), we get a palindrome (88756065788).

The spelling of 25621053136 in words is "twenty-five billion, six hundred twenty-one million, fifty-three thousand, one hundred thirty-six".