12006500861 has 2 divisors, whose sum is σ = 12006500862. Its totient is φ = 12006500860.

The previous prime is 12006500839. The next prime is 12006500899. The reversal of 12006500861 is 16800560021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10692800836 + 1313700025 = 103406^2 + 36245^2 .

It is a cyclic number.

It is not a de Polignac number, because 12006500861 - 2¹⁰ = 12006499837 is a prime.

It is a super-3 number, since 3×12006500861³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (62006500861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6003250430 + 6003250431.

It is an arithmetic number, because the mean of its divisors is an integer number (6003250431).

Almost surely, 2^12006500861 is an apocalyptic number.

It is an amenable number.

12006500861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12006500861 is an equidigital number, since it uses as much as digits as its factorization.

12006500861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 12006500861 in words is "twelve billion, six million, five hundred thousand, eight hundred sixty-one".