12155125500 has 144 divisors (see below), whose sum is σ = 43823392704. Its totient is φ = 2778307200.

The previous prime is 12155125487. The next prime is 12155125519. The reversal of 12155125500 is 552155121.

12155125500 is a `hidden beast` number, since 1 + 2 + 155 + 1 + 2 + 5 + 500 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161439 + ... + 224438.

It is an arithmetic number, because the mean of its divisors is an integer number (304329116).

Almost surely, 2^12155125500 is an apocalyptic number.

12155125500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155125500 is an abundant number, since it is smaller than the sum of its proper divisors (31668267204).

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

12155125500 is a wasteful number, since it uses less digits than its factorization.

12155125500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385909 (or 385894 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The spelling of 12155125500 in words is "twelve billion, one hundred fifty-five million, one hundred twenty-five thousand, five hundred".