12621661500 has 96 divisors (see below), whose sum is σ = 42004924416. Its totient is φ = 2884948800.

The previous prime is 12621661489. The next prime is 12621661531. The reversal of 12621661500 is 516612621.

12621661500 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 (30).

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 31 ways as a sum of consecutive naturals, for example, 590532 + ... + 611531.

It is an arithmetic number, because the mean of its divisors is an integer number (437551296).

Almost surely, 2^12621661500 is an apocalyptic number.

12621661500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12621661500 is an abundant number, since it is smaller than the sum of its proper divisors (29383262916).

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

12621661500 is a wasteful number, since it uses less digits than its factorization.

12621661500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202092 (or 1202080 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 12621661500 in words is "twelve billion, six hundred twenty-one million, six hundred sixty-one thousand, five hundred".