25216324536 has 128 divisors (see below), whose sum is σ = 73556017920. Its totient is φ = 7132575744.

The previous prime is 25216324501. The next prime is 25216324559. The reversal of 25216324536 is 63542361252.

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 = 25216324494 and 25216324503.

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, 172791 + ... + 283353.

It is an arithmetic number, because the mean of its divisors is an integer number (574656390).

Almost surely, 2^25216324536 is an apocalyptic number.

25216324536 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 25216324536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36778008960).

25216324536 is an abundant number, since it is smaller than the sum of its proper divisors (48339693384).

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

25216324536 is a wasteful number, since it uses less digits than its factorization.

25216324536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110645 (or 110641 counting only the distinct ones).

The product of its digits is 259200, while the sum is 39.

Adding to 25216324536 its reverse (63542361252), we get a palindrome (88758685788).

The spelling of 25216324536 in words is "twenty-five billion, two hundred sixteen million, three hundred twenty-four thousand, five hundred thirty-six".