25203215453550 has 144 divisors (see below), whose sum is σ = 64900141459920. Its totient is φ = 6472409646080.

The previous prime is 25203215453519. The next prime is 25203215453557. The reversal of 25203215453550 is 5535451230252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25203215453557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 48815554 + ... + 49329146.

It is an arithmetic number, because the mean of its divisors is an integer number (450695426805).

Almost surely, 2^{25203215453550} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25203215453550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32450070729960).

25203215453550 is an abundant number, since it is smaller than the sum of its proper divisors (39696926006370).

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

25203215453550 is a wasteful number, since it uses less digits than its factorization.

25203215453550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514055 (or 514021 counting only the distinct ones).

The product of its (nonzero) digits is 900000, while the sum is 42.

The spelling of 25203215453550 in words is "twenty-five trillion, two hundred three billion, two hundred fifteen million, four hundred fifty-three thousand, five hundred fifty".