12145655808 has 420 divisors, whose sum is σ = 42630885528. Its totient is φ = 3397386240.

The previous prime is 12145655791. The next prime is 12145655813. The reversal of 12145655808 is 80855654121.

12145655808 is a `hidden beast` number, since 1 + 2 + 1 + 4 + 5 + 65 + 580 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 934281210 + ... + 934281222.

Almost surely, 2^12145655808 is an apocalyptic number.

12145655808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12145655808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21315442764).

12145655808 is an abundant number, since it is smaller than the sum of its proper divisors (30485229720).

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

12145655808 is an frugal number, since it uses more digits than its factorization.

12145655808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 29 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 45.

The spelling of 12145655808 in words is "twelve billion, one hundred forty-five million, six hundred fifty-five thousand, eight hundred eight".