25400236536 has 96 divisors (see below), whose sum is σ = 70249570560. Its totient is φ = 8288951616.

The previous prime is 25400236501. The next prime is 25400236541. The reversal of 25400236536 is 63563200452.

25400236536 is a `hidden beast` number, since 2 + 540 + 0 + 23 + 65 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 25400236536.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 770161 + ... + 802463.

It is an arithmetic number, because the mean of its divisors is an integer number (731766360).

Almost surely, 2^25400236536 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 25400236536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35124785280).

25400236536 is an abundant number, since it is smaller than the sum of its proper divisors (44849334024).

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

25400236536 is a wasteful number, since it uses less digits than its factorization.

25400236536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32545 (or 32538 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 25400236536 its reverse (63563200452), we get a palindrome (88963436988).

The spelling of 25400236536 in words is "twenty-five billion, four hundred million, two hundred thirty-six thousand, five hundred thirty-six".