25223420550 has 96 divisors (see below), whose sum is σ = 66056486400. Its totient is φ = 6351903360.

The previous prime is 25223420549. The next prime is 25223420633. The reversal of 25223420550 is 5502432252.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 889491 + ... + 917409.

It is an arithmetic number, because the mean of its divisors is an integer number (688088400).

Almost surely, 2^25223420550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25223420550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33028243200).

25223420550 is an abundant number, since it is smaller than the sum of its proper divisors (40833065850).

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

25223420550 is a wasteful number, since it uses less digits than its factorization.

25223420550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28270 (or 28265 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 30.

The spelling of 25223420550 in words is "twenty-five billion, two hundred twenty-three million, four hundred twenty thousand, five hundred fifty".