25063440636 has 96 divisors (see below), whose sum is σ = 64115021376. Its totient is φ = 7573248000.

The previous prime is 25063440613. The next prime is 25063440643. The reversal of 25063440636 is 63604436052.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 25063440594 and 25063440603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7239946 + ... + 7243406.

It is an arithmetic number, because the mean of its divisors is an integer number (667864806).

Almost surely, 2^25063440636 is an apocalyptic number.

25063440636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25063440636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32057510688).

25063440636 is an abundant number, since it is smaller than the sum of its proper divisors (39051580740).

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

25063440636 is a wasteful number, since it uses less digits than its factorization.

25063440636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303 (or 4301 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 39.

Adding to 25063440636 its reverse (63604436052), we get a palindrome (88667876688).

The spelling of 25063440636 in words is "twenty-five billion, sixty-three million, four hundred forty thousand, six hundred thirty-six".