25857442944 has 128 divisors (see below), whose sum is σ = 76822320000. Its totient is φ = 8561894400.

The previous prime is 25857442943. The next prime is 25857442993. The reversal of 25857442944 is 44924475852.

25857442944 is a `hidden beast` number, since 2 + 5 + 8 + 574 + 4 + 29 + 44 = 666.

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 (54).

It is not an unprimeable number, because it can be changed into a prime (25857442943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 497082 + ... + 546630.

It is an arithmetic number, because the mean of its divisors is an integer number (600174375).

Almost surely, 2^25857442944 is an apocalyptic number.

25857442944 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 25857442944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38411160000).

25857442944 is an abundant number, since it is smaller than the sum of its proper divisors (50964877056).

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

25857442944 is a wasteful number, since it uses less digits than its factorization.

25857442944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49723 (or 49705 counting only the distinct ones).

The product of its digits is 12902400, while the sum is 54.

The spelling of 25857442944 in words is "twenty-five billion, eight hundred fifty-seven million, four hundred forty-two thousand, nine hundred forty-four".