161662273 has 4 divisors (see below), whose sum is σ = 161700820. Its totient is φ = 161623728.

The previous prime is 161662247. The next prime is 161662283. The reversal of 161662273 is 372266161.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50296464 + 111365809 = 7092^2 + 10553^2 .

It is a cyclic number.

It is not a de Polignac number, because 161662273 - 2⁹ = 161661761 is a prime.

It is a super-2 number, since 2×161662273² = 52269381023053058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161662283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12090 + ... + 21667.

It is an arithmetic number, because the mean of its divisors is an integer number (40425205).

Almost surely, 2^161662273 is an apocalyptic number.

It is an amenable number.

161662273 is a deficient number, since it is larger than the sum of its proper divisors (38547).

161662273 is an equidigital number, since it uses as much as digits as its factorization.

161662273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38546.

The product of its digits is 18144, while the sum is 34.

The square root of 161662273 is about 12714.6479699597. The cubic root of 161662273 is about 544.7570928856.

The spelling of 161662273 in words is "one hundred sixty-one million, six hundred sixty-two thousand, two hundred seventy-three".