25138540784 has 80 divisors (see below), whose sum is σ = 55944038400. Its totient is φ = 10719620352.

The previous prime is 25138540771. The next prime is 25138540787. The reversal of 25138540784 is 48704583152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25138540787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33207734 + ... + 33208490.

It is an arithmetic number, because the mean of its divisors is an integer number (699300480).

Almost surely, 2^25138540784 is an apocalyptic number.

It is an amenable number.

25138540784 is an abundant number, since it is smaller than the sum of its proper divisors (30805497616).

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

25138540784 is a wasteful number, since it uses less digits than its factorization.

25138540784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870 (or 1864 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 47.

The spelling of 25138540784 in words is "twenty-five billion, one hundred thirty-eight million, five hundred forty thousand, seven hundred eighty-four".