25423213530 has 512 divisors, whose sum is σ = 80263249920. Its totient is φ = 5056128000.

The previous prime is 25423213433. The next prime is 25423213531. The reversal of 25423213530 is 3531232452.

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

It is not an unprimeable number, because it can be changed into a prime (25423213531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 133105735 + ... + 133105925.

It is an arithmetic number, because the mean of its divisors is an integer number (156764160).

Almost surely, 2^25423213530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25423213530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40131624960).

25423213530 is an abundant number, since it is smaller than the sum of its proper divisors (54840036390).

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

25423213530 is a wasteful number, since it uses less digits than its factorization.

25423213530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338.

The product of its (nonzero) digits is 21600, while the sum is 30.

Adding to 25423213530 its reverse (3531232452), we get a palindrome (28954445982).

It can be divided in two parts, 254232 and 13530, that added together give a palindrome (267762).

The spelling of 25423213530 in words is "twenty-five billion, four hundred twenty-three million, two hundred thirteen thousand, five hundred thirty".