12180987961 has 2 divisors, whose sum is σ = 12180987962. Its totient is φ = 12180987960.

The previous prime is 12180987877. The next prime is 12180987983. The reversal of 12180987961 is 16978908121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8074100736 + 4106887225 = 89856^2 + 64085^2 .

It is a cyclic number.

It is not a de Polignac number, because 12180987961 - 2²¹ = 12178890809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12180987899 and 12180987908.

It is not a weakly prime, because it can be changed into another prime (12180987061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6090493980 + 6090493981.

It is an arithmetic number, because the mean of its divisors is an integer number (6090493981).

Almost surely, 2^12180987961 is an apocalyptic number.

It is an amenable number.

12180987961 is a deficient number, since it is larger than the sum of its proper divisors (1).

12180987961 is an equidigital number, since it uses as much as digits as its factorization.

12180987961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 52.

The spelling of 12180987961 in words is "twelve billion, one hundred eighty million, nine hundred eighty-seven thousand, nine hundred sixty-one".