12081806651 has 4 divisors (see below), whose sum is σ = 12376484904. Its totient is φ = 11787128400.

The previous prime is 12081806647. The next prime is 12081806657. The reversal of 12081806651 is 15660818021.

12081806651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15660818021 = 659 ⋅23764519.

It is a cyclic number.

It is not a de Polignac number, because 12081806651 - 2² = 12081806647 is a prime.

It is a super-3 number, since 3×12081806651³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12081806657) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 147339065 + ... + 147339146.

It is an arithmetic number, because the mean of its divisors is an integer number (3094121226).

Almost surely, 2^12081806651 is an apocalyptic number.

12081806651 is a deficient number, since it is larger than the sum of its proper divisors (294678253).

12081806651 is an equidigital number, since it uses as much as digits as its factorization.

12081806651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294678252.

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 12081806651 in words is "twelve billion, eighty-one million, eight hundred six thousand, six hundred fifty-one".