161667073 has 2 divisors, whose sum is σ = 161667074. Its totient is φ = 161667072.

The previous prime is 161667061. The next prime is 161667109. The reversal of 161667073 is 370766161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153561664 + 8105409 = 12392^2 + 2847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161667073 is a prime.

It is a super-2 number, since 2×161667073² = 52272484984774658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161667043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80833536 + 80833537.

It is an arithmetic number, because the mean of its divisors is an integer number (80833537).

Almost surely, 2^161667073 is an apocalyptic number.

It is an amenable number.

161667073 is a deficient number, since it is larger than the sum of its proper divisors (1).

161667073 is an equidigital number, since it uses as much as digits as its factorization.

161667073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 161667073 is about 12714.8367272254. The cubic root of 161667073 is about 544.7624843891.

The spelling of 161667073 in words is "one hundred sixty-one million, six hundred sixty-seven thousand, seventy-three".