25384136064 has 128 divisors (see below), whose sum is σ = 77490950400. Its totient is φ = 7211956224.

The previous prime is 25384136027. The next prime is 25384136083. The reversal of 25384136064 is 46063148352.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 454774 + ... + 507530.

It is an arithmetic number, because the mean of its divisors is an integer number (605398050).

Almost surely, 2^25384136064 is an apocalyptic number.

25384136064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25384136064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38745475200).

25384136064 is an abundant number, since it is smaller than the sum of its proper divisors (52106814336).

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

25384136064 is a wasteful number, since it uses less digits than its factorization.

25384136064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52960 (or 52948 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 25384136064 in words is "twenty-five billion, three hundred eighty-four million, one hundred thirty-six thousand, sixty-four".