187561980913 has 2 divisors, whose sum is σ = 187561980914. Its totient is φ = 187561980912.

The previous prime is 187561980887. The next prime is 187561980923. The reversal of 187561980913 is 319089165781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101896300944 + 85665679969 = 319212^2 + 292687^2 .

It is a cyclic number.

It is not a de Polignac number, because 187561980913 - 2¹⁷ = 187561849841 is a prime.

It is not a weakly prime, because it can be changed into another prime (187561980923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93780990456 + 93780990457.

It is an arithmetic number, because the mean of its divisors is an integer number (93780990457).

Almost surely, 2^187561980913 is an apocalyptic number.

It is an amenable number.

187561980913 is a deficient number, since it is larger than the sum of its proper divisors (1).

187561980913 is an equidigital number, since it uses as much as digits as its factorization.

187561980913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 58.

The spelling of 187561980913 in words is "one hundred eighty-seven billion, five hundred sixty-one million, nine hundred eighty thousand, nine hundred thirteen".