25215116346 has 128 divisors (see below), whose sum is σ = 68568768000. Its totient is φ = 6704197632.

The previous prime is 25215116323. The next prime is 25215116371. The reversal of 25215116346 is 64361151252.

25215116346 is a `hidden beast` number, since 2 + 5 + 2 + 1 + 5 + 11 + 634 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25215116346.

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, 549870 + ... + 593958.

It is an arithmetic number, because the mean of its divisors is an integer number (535693500).

Almost surely, 2^25215116346 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25215116346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34284384000).

25215116346 is an abundant number, since it is smaller than the sum of its proper divisors (43353651654).

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

25215116346 is a wasteful number, since it uses less digits than its factorization.

25215116346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44213 (or 44207 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

Adding to 25215116346 its reverse (64361151252), we get a palindrome (89576267598).

The spelling of 25215116346 in words is "twenty-five billion, two hundred fifteen million, one hundred sixteen thousand, three hundred forty-six".