25543221504 has 288 divisors, whose sum is σ = 73014165504. Its totient is φ = 7910031360.

The previous prime is 25543221499. The next prime is 25543221593. The reversal of 25543221504 is 40512234552.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133734049 + ... + 133734239.

It is an arithmetic number, because the mean of its divisors is an integer number (253521408).

Almost surely, 2^25543221504 is an apocalyptic number.

25543221504 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 25543221504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36507082752).

25543221504 is an abundant number, since it is smaller than the sum of its proper divisors (47470944000).

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

25543221504 is a wasteful number, since it uses less digits than its factorization.

25543221504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 25543221504 in words is "twenty-five billion, five hundred forty-three million, two hundred twenty-one thousand, five hundred four".