25436863564 has 96 divisors (see below), whose sum is σ = 54752495616. Its totient is φ = 10092149760.

The previous prime is 25436863553. The next prime is 25436863607. The reversal of 25436863564 is 46536863452.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 25109922 + ... + 25110934.

It is an arithmetic number, because the mean of its divisors is an integer number (570338496).

Almost surely, 2^25436863564 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 25436863564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27376247808).

25436863564 is an abundant number, since it is smaller than the sum of its proper divisors (29315632052).

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

25436863564 is a wasteful number, since it uses less digits than its factorization.

25436863564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855 (or 1853 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 52.

The spelling of 25436863564 in words is "twenty-five billion, four hundred thirty-six million, eight hundred sixty-three thousand, five hundred sixty-four".