12181928977 has 2 divisors, whose sum is σ = 12181928978. Its totient is φ = 12181928976.

The previous prime is 12181928929. The next prime is 12181928987. The reversal of 12181928977 is 77982918121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7946652736 + 4235276241 = 89144^2 + 65079^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12181928977 is a prime.

It is not a weakly prime, because it can be changed into another prime (12181928987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6090964488 + 6090964489.

It is an arithmetic number, because the mean of its divisors is an integer number (6090964489).

Almost surely, 2^12181928977 is an apocalyptic number.

It is an amenable number.

12181928977 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181928977 is an equidigital number, since it uses as much as digits as its factorization.

12181928977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 55.

The spelling of 12181928977 in words is "twelve billion, one hundred eighty-one million, nine hundred twenty-eight thousand, nine hundred seventy-seven".