25443553464 has 160 divisors (see below), whose sum is σ = 82195106400. Its totient is φ = 7202753280.

The previous prime is 25443553453. The next prime is 25443553519. The reversal of 25443553464 is 46435534452.

25443553464 is a `hidden beast` number, since 2 + 54 + 4 + 3 + 5 + 534 + 64 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 468694 + ... + 520154.

It is an arithmetic number, because the mean of its divisors is an integer number (513719415).

Almost surely, 2^25443553464 is an apocalyptic number.

25443553464 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 25443553464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41097553200).

25443553464 is an abundant number, since it is smaller than the sum of its proper divisors (56751552936).

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

25443553464 is a wasteful number, since it uses less digits than its factorization.

25443553464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51595 (or 51582 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 45.

The spelling of 25443553464 in words is "twenty-five billion, four hundred forty-three million, five hundred fifty-three thousand, four hundred sixty-four".