12165901020 has 864 divisors, whose sum is σ = 50134855680. Its totient is φ = 2329067520.

The previous prime is 12165901009. The next prime is 12165901079. The reversal of 12165901020 is 2010956121.

12165901020 is a `hidden beast` number, since 1 + 2 + 1 + 659 + 0 + 1 + 0 + 2 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 125421612 + ... + 125421708.

Almost surely, 2^12165901020 is an apocalyptic number.

12165901020 is a gapful number since it is divisible by the number (10) 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 12165901020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25067427840).

12165901020 is an abundant number, since it is smaller than the sum of its proper divisors (37968954660).

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

12165901020 is a wasteful number, since it uses less digits than its factorization.

12165901020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The spelling of 12165901020 in words is "twelve billion, one hundred sixty-five million, nine hundred one thousand, twenty".