12165642500 has 180 divisors, whose sum is σ = 29561424816. Its totient is φ = 4375800000.

The previous prime is 12165642427. The next prime is 12165642523. The reversal of 12165642500 is 524656121.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 39627347 + ... + 39627653.

Almost surely, 2^12165642500 is an apocalyptic number.

12165642500 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 12165642500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14780712408).

12165642500 is an abundant number, since it is smaller than the sum of its proper divisors (17395782316).

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

12165642500 is a wasteful number, since it uses less digits than its factorization.

12165642500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 12165642500 in words is "twelve billion, one hundred sixty-five million, six hundred forty-two thousand, five hundred".