25694471440 has 80 divisors (see below), whose sum is σ = 65275214976. Its totient is φ = 9328435200.

The previous prime is 25694471417. The next prime is 25694471441. The reversal of 25694471440 is 4417449652.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (25694471441) 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, 532144 + ... + 578416.

Almost surely, 2^25694471440 is an apocalyptic number.

25694471440 is a gapful number since it is divisible by the number (20) 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 25694471440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32637607488).

25694471440 is an abundant number, since it is smaller than the sum of its proper divisors (39580743536).

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

25694471440 is a wasteful number, since it uses less digits than its factorization.

25694471440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46928 (or 46922 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 25694471440 in words is "twenty-five billion, six hundred ninety-four million, four hundred seventy-one thousand, four hundred forty".