161977867 has 2 divisors, whose sum is σ = 161977868. Its totient is φ = 161977866.

The previous prime is 161977859. The next prime is 161977877. The reversal of 161977867 is 768779161.

161977867 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 161977867 - 2³ = 161977859 is a prime.

It is not a weakly prime, because it can be changed into another prime (161977877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80988933 + 80988934.

It is an arithmetic number, because the mean of its divisors is an integer number (80988934).

Almost surely, 2^161977867 is an apocalyptic number.

161977867 is a deficient number, since it is larger than the sum of its proper divisors (1).

161977867 is an equidigital number, since it uses as much as digits as its factorization.

161977867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 52.

The square root of 161977867 is about 12727.0525653036. The cubic root of 161977867 is about 545.1113505893. Note that the first 3 decimals are identical.

The spelling of 161977867 in words is "one hundred sixty-one million, nine hundred seventy-seven thousand, eight hundred sixty-seven".