25405315212 has 48 divisors (see below), whose sum is σ = 61021078272. Its totient is φ = 8221940160.

The previous prime is 25405315171. The next prime is 25405315213. The reversal of 25405315212 is 21251350452.

It is a self number, because there is not a number n which added to its sum of digits gives 25405315212.

It is not an unprimeable number, because it can be changed into a prime (25405315213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61239 + ... + 233582.

It is an arithmetic number, because the mean of its divisors is an integer number (1271272464).

Almost surely, 2^25405315212 is an apocalyptic number.

It is an amenable number.

25405315212 is an abundant number, since it is smaller than the sum of its proper divisors (35615763060).

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

25405315212 is a wasteful number, since it uses less digits than its factorization.

25405315212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295038 (or 295036 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 25405315212 its reverse (21251350452), we get a palindrome (46656665664).

The spelling of 25405315212 in words is "twenty-five billion, four hundred five million, three hundred fifteen thousand, two hundred twelve".