25123011540 has 48 divisors (see below), whose sum is σ = 76739382720. Its totient is φ = 6090426880.

The previous prime is 25123011509. The next prime is 25123011577. The reversal of 25123011540 is 4511032152.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 25123011540.

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, 19031925 + ... + 19033244.

It is an arithmetic number, because the mean of its divisors is an integer number (1598737140).

Almost surely, 2^25123011540 is an apocalyptic number.

25123011540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25123011540 is an abundant number, since it is smaller than the sum of its proper divisors (51616371180).

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

25123011540 is a wasteful number, since it uses less digits than its factorization.

25123011540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38065192 (or 38065190 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 25123011540 its reverse (4511032152), we get a palindrome (29634043692).

The spelling of 25123011540 in words is "twenty-five billion, one hundred twenty-three million, eleven thousand, five hundred forty".