25534212520 has 64 divisors (see below), whose sum is σ = 58242240000. Its totient is φ = 10073476608.

The previous prime is 25534212503. The next prime is 25534212521. The reversal of 25534212520 is 2521243552.

It is not an unprimeable number, because it can be changed into a prime (25534212521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3310989 + ... + 3318691.

It is an arithmetic number, because the mean of its divisors is an integer number (910035000).

Almost surely, 2^25534212520 is an apocalyptic number.

25534212520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25534212520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29121120000).

25534212520 is an abundant number, since it is smaller than the sum of its proper divisors (32708027480).

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

25534212520 is a wasteful number, since it uses less digits than its factorization.

25534212520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8842 (or 8838 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 25534212520 in words is "twenty-five billion, five hundred thirty-four million, two hundred twelve thousand, five hundred twenty".