25535220330 has 128 divisors (see below), whose sum is σ = 64343102976. Its totient is φ = 6478617600.

The previous prime is 25535220317. The next prime is 25535220349. The reversal of 25535220330 is 3302253552.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24766915 + ... + 24767945.

It is an arithmetic number, because the mean of its divisors is an integer number (502680492).

Almost surely, 2^25535220330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25535220330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32171551488).

25535220330 is an abundant number, since it is smaller than the sum of its proper divisors (38807882646).

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

25535220330 is a wasteful number, since it uses less digits than its factorization.

25535220330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552.

The product of its (nonzero) digits is 27000, while the sum is 30.

Adding to 25535220330 its reverse (3302253552), we get a palindrome (28837473882).

The spelling of 25535220330 in words is "twenty-five billion, five hundred thirty-five million, two hundred twenty thousand, three hundred thirty".