25158121212 has 96 divisors (see below), whose sum is σ = 67846431744. Its totient is φ = 7107033600.

The previous prime is 25158121189. The next prime is 25158121243. The reversal of 25158121212 is 21212185152.

It is a self number, because there is not a number n which added to its sum of digits gives 25158121212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6582262 + ... + 6586082.

It is an arithmetic number, because the mean of its divisors is an integer number (706733664).

Almost surely, 2^25158121212 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 25158121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33923215872).

25158121212 is an abundant number, since it is smaller than the sum of its proper divisors (42688310532).

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

25158121212 is a wasteful number, since it uses less digits than its factorization.

25158121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4699 (or 4697 counting only the distinct ones).

The product of its digits is 3200, while the sum is 30.

The spelling of 25158121212 in words is "twenty-five billion, one hundred fifty-eight million, one hundred twenty-one thousand, two hundred twelve".