12908505965550 has 192 divisors, whose sum is σ = 34603811214336. Its totient is φ = 3165675955200.

The previous prime is 12908505965549. The next prime is 12908505965557. The reversal of 12908505965550 is 5556950580921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12908505965557) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1614972354 + ... + 1614980346.

It is an arithmetic number, because the mean of its divisors is an integer number (180228183408).

Almost surely, 2^{12908505965550} is an apocalyptic number.

12908505965550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12908505965550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17301905607168).

12908505965550 is an abundant number, since it is smaller than the sum of its proper divisors (21695305248786).

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

12908505965550 is a wasteful number, since it uses less digits than its factorization.

12908505965550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10995 (or 10990 counting only the distinct ones).

The product of its (nonzero) digits is 24300000, while the sum is 60.

The spelling of 12908505965550 in words is "twelve trillion, nine hundred eight billion, five hundred five million, nine hundred sixty-five thousand, five hundred fifty".