25516003212 has 192 divisors, whose sum is σ = 79230412800. Its totient is φ = 6943242240.

The previous prime is 25516003207. The next prime is 25516003237. The reversal of 25516003212 is 21230061552.

It is a happy number.

25516003212 is a `hidden beast` number, since 2 + 5 + 51 + 600 + 3 + 2 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 4187464 + ... + 4193552.

It is an arithmetic number, because the mean of its divisors is an integer number (412658400).

Almost surely, 2^25516003212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25516003212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39615206400).

25516003212 is an abundant number, since it is smaller than the sum of its proper divisors (53714409588).

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

25516003212 is a wasteful number, since it uses less digits than its factorization.

25516003212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6373 (or 6365 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 25516003212 its reverse (21230061552), we get a palindrome (46746064764).

The spelling of 25516003212 in words is "twenty-five billion, five hundred sixteen million, three thousand, two hundred twelve".