12027511861 has 2 divisors, whose sum is σ = 12027511862. Its totient is φ = 12027511860.

The previous prime is 12027511817. The next prime is 12027511919. The reversal of 12027511861 is 16811572021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7674811236 + 4352700625 = 87606^2 + 65975^2 .

It is an emirp because it is prime and its reverse (16811572021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12027511861 - 2⁷ = 12027511733 is a prime.

It is a super-2 number, since 2×12027511861² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12027511361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6013755930 + 6013755931.

It is an arithmetic number, because the mean of its divisors is an integer number (6013755931).

Almost surely, 2^12027511861 is an apocalyptic number.

It is an amenable number.

12027511861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12027511861 is an equidigital number, since it uses as much as digits as its factorization.

12027511861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 34.

The spelling of 12027511861 in words is "twelve billion, twenty-seven million, five hundred eleven thousand, eight hundred sixty-one".