12155787000 has 192 divisors, whose sum is σ = 46956312000. Its totient is φ = 2778451200.

The previous prime is 12155786989. The next prime is 12155787023. The reversal of 12155787000 is 78755121.

12155787000 is a `hidden beast` number, since 1 + 2 + 15 + 578 + 70 + 0 + 0 = 666.

12155787000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33475 + ... + 159474.

It is an arithmetic number, because the mean of its divisors is an integer number (244564125).

Almost surely, 2^12155787000 is an apocalyptic number.

12155787000 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 12155787000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23478156000).

12155787000 is an abundant number, since it is smaller than the sum of its proper divisors (34800525000).

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

12155787000 is a wasteful number, since it uses less digits than its factorization.

12155787000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192983 (or 192966 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 36.

The spelling of 12155787000 in words is "twelve billion, one hundred fifty-five million, seven hundred eighty-seven thousand".