25215105630 has 128 divisors (see below), whose sum is σ = 72438105600. Its totient is φ = 5536028160.

The previous prime is 25215105583. The next prime is 25215105631. The reversal of 25215105630 is 3650151252.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25215105631) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 171921 + ... + 282819.

It is an arithmetic number, because the mean of its divisors is an integer number (565922700).

Almost surely, 2^25215105630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25215105630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36219052800).

25215105630 is an abundant number, since it is smaller than the sum of its proper divisors (47222999970).

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

25215105630 is a wasteful number, since it uses less digits than its factorization.

25215105630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110986.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 25215105630 its reverse (3650151252), we get a palindrome (28865256882).

The spelling of 25215105630 in words is "twenty-five billion, two hundred fifteen million, one hundred five thousand, six hundred thirty".