161667071 has 4 divisors (see below), whose sum is σ = 163944144. Its totient is φ = 159390000.

The previous prime is 161667061. The next prime is 161667073. The reversal of 161667071 is 170766161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161667071 - 2²⁶ = 94558207 is a prime.

It is a super-2 number, since 2×161667071² = 52272483691438082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161667073) 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 in 3 ways as a sum of consecutive naturals, for example, 1138430 + ... + 1138571.

It is an arithmetic number, because the mean of its divisors is an integer number (40986036).

Almost surely, 2^161667071 is an apocalyptic number.

161667071 is a deficient number, since it is larger than the sum of its proper divisors (2277073).

161667071 is an equidigital number, since it uses as much as digits as its factorization.

161667071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277072.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 161667071 is about 12714.8366485771. The cubic root of 161667071 is about 544.7624821427.

The spelling of 161667071 in words is "one hundred sixty-one million, six hundred sixty-seven thousand, seventy-one".