25799557950 has 108 divisors (see below), whose sum is σ = 71240518440. Its totient is φ = 6693779520.

The previous prime is 25799557933. The next prime is 25799557963. The reversal of 25799557950 is 5975599752.

25799557950 is a `hidden beast` number, since 2 + 5 + 7 + 9 + 9 + 5 + 579 + 50 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 595111 + ... + 636989.

It is an arithmetic number, because the mean of its divisors is an integer number (659634430).

Almost surely, 2^25799557950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25799557950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35620259220).

25799557950 is an abundant number, since it is smaller than the sum of its proper divisors (45440960490).

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

25799557950 is a wasteful number, since it uses less digits than its factorization.

25799557950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41971 (or 41926 counting only the distinct ones).

The product of its (nonzero) digits is 44651250, while the sum is 63.

The spelling of 25799557950 in words is "twenty-five billion, seven hundred ninety-nine million, five hundred fifty-seven thousand, nine hundred fifty".