161976878887 has 2 divisors, whose sum is σ = 161976878888. Its totient is φ = 161976878886.

The previous prime is 161976878857. The next prime is 161976878909. The reversal of 161976878887 is 788878679161.

161976878887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161976878887 - 2²⁷ = 161842661159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161976878807) 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, 80988439443 + 80988439444.

It is an arithmetic number, because the mean of its divisors is an integer number (80988439444).

Almost surely, 2^161976878887 is an apocalyptic number.

161976878887 is a deficient number, since it is larger than the sum of its proper divisors (1).

161976878887 is an equidigital number, since it uses as much as digits as its factorization.

161976878887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 455196672, while the sum is 76.

The spelling of 161976878887 in words is "one hundred sixty-one billion, nine hundred seventy-six million, eight hundred seventy-eight thousand, eight hundred eighty-seven".