25564534140 has 48 divisors (see below), whose sum is σ = 74049000480. Its totient is φ = 6582132480.

The previous prime is 25564534129. The next prime is 25564534189. The reversal of 25564534140 is 4143546552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7344391 + ... + 7347870.

It is an arithmetic number, because the mean of its divisors is an integer number (1542687510).

Almost surely, 2^25564534140 is an apocalyptic number.

25564534140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25564534140 is an abundant number, since it is smaller than the sum of its proper divisors (48484466340).

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

25564534140 is a wasteful number, since it uses less digits than its factorization.

25564534140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14692302 (or 14692300 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

The spelling of 25564534140 in words is "twenty-five billion, five hundred sixty-four million, five hundred thirty-four thousand, one hundred forty".