12720733650 has 72 divisors (see below), whose sum is σ = 36186767604. Its totient is φ = 3192652800.

The previous prime is 12720733609. The next prime is 12720733651. The reversal of 12720733650 is 5633702721.

12720733650 is a `hidden beast` number, since 1 + 272 + 0 + 7 + 336 + 50 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 5933774961 + 6786958689 = 77031^2 + 82383^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12720733651) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 823771 + ... + 839070.

Almost surely, 2^12720733650 is an apocalyptic number.

12720733650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12720733650 is an abundant number, since it is smaller than the sum of its proper divisors (23466033954).

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

12720733650 is a wasteful number, since it uses less digits than its factorization.

12720733650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662876 (or 1662868 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The spelling of 12720733650 in words is "twelve billion, seven hundred twenty million, seven hundred thirty-three thousand, six hundred fifty".