161671667 has 2 divisors, whose sum is σ = 161671668. Its totient is φ = 161671666.

The previous prime is 161671663. The next prime is 161671673. The reversal of 161671667 is 766176161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161671667 - 2² = 161671663 is a prime.

It is a super-2 number, since 2×161671667² = 52275455821117778, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161671663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80835833 + 80835834.

It is an arithmetic number, because the mean of its divisors is an integer number (80835834).

Almost surely, 2^161671667 is an apocalyptic number.

161671667 is a deficient number, since it is larger than the sum of its proper divisors (1).

161671667 is an equidigital number, since it uses as much as digits as its factorization.

161671667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 41.

The square root of 161671667 is about 12715.0173810341. The cubic root of 161671667 is about 544.7676444074.

The spelling of 161671667 in words is "one hundred sixty-one million, six hundred seventy-one thousand, six hundred sixty-seven".