161631058187 has 2 divisors, whose sum is σ = 161631058188. Its totient is φ = 161631058186.

The previous prime is 161631058177. The next prime is 161631058261. The reversal of 161631058187 is 781850136161.

161631058187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161631058187 - 2¹⁸ = 161630796043 is a prime.

It is a super-2 number, since 2×161631058187² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161631058157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80815529093 + 80815529094.

It is an arithmetic number, because the mean of its divisors is an integer number (80815529094).

Almost surely, 2^161631058187 is an apocalyptic number.

161631058187 is a deficient number, since it is larger than the sum of its proper divisors (1).

161631058187 is an equidigital number, since it uses as much as digits as its factorization.

161631058187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 161631058187 in words is "one hundred sixty-one billion, six hundred thirty-one million, fifty-eight thousand, one hundred eighty-seven".