25287419550 has 72 divisors (see below), whose sum is σ = 62928679896. Its totient is φ = 6720167360.

The previous prime is 25287419537. The next prime is 25287419557. The reversal of 25287419550 is 5591478252.

It is a self number, because there is not a number n which added to its sum of digits gives 25287419550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25287419557) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 32712964 + ... + 32713736.

It is an arithmetic number, because the mean of its divisors is an integer number (874009443).

Almost surely, 2^25287419550 is an apocalyptic number.

25287419550 is an abundant number, since it is smaller than the sum of its proper divisors (37641260346).

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

25287419550 is an equidigital number, since it uses as much as digits as its factorization.

25287419550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 48.

The spelling of 25287419550 in words is "twenty-five billion, two hundred eighty-seven million, four hundred nineteen thousand, five hundred fifty".