12237577861 has 2 divisors, whose sum is σ = 12237577862. Its totient is φ = 12237577860.

The previous prime is 12237577843. The next prime is 12237577873. The reversal of 12237577861 is 16877573221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7672008100 + 4565569761 = 87590^2 + 67569^2 .

It is an emirp because it is prime and its reverse (16877573221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12237577861 - 2⁵ = 12237577829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12237577811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6118788930 + 6118788931.

It is an arithmetic number, because the mean of its divisors is an integer number (6118788931).

Almost surely, 2^12237577861 is an apocalyptic number.

It is an amenable number.

12237577861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12237577861 is an equidigital number, since it uses as much as digits as its factorization.

12237577861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The spelling of 12237577861 in words is "twelve billion, two hundred thirty-seven million, five hundred seventy-seven thousand, eight hundred sixty-one".