12012621650 has 24 divisors (see below), whose sum is σ = 22947357540. Its totient is φ = 4675181760.

The previous prime is 12012621641. The next prime is 12012621661. The reversal of 12012621650 is 5612621021.

It can be written as a sum of positive squares in 6 ways, for example, as 8391109609 + 3621512041 = 91603^2 + 60179^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3244805 + ... + 3248504.

Almost surely, 2^12012621650 is an apocalyptic number.

12012621650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12012621650 is a deficient number, since it is larger than the sum of its proper divisors (10934735890).

12012621650 is a wasteful number, since it uses less digits than its factorization.

12012621650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6493358 (or 6493353 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 12012621650 in words is "twelve billion, twelve million, six hundred twenty-one thousand, six hundred fifty".