161223466 has 4 divisors (see below), whose sum is σ = 241835202. Its totient is φ = 80611732.

The previous prime is 161223451. The next prime is 161223479. The reversal of 161223466 is 664322161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 664322161 = 37 ⋅17954653.

It can be written as a sum of positive squares in only one way, i.e., 139925241 + 21298225 = 11829^2 + 4615^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40305865 + ... + 40305868.

Almost surely, 2^161223466 is an apocalyptic number.

161223466 is a deficient number, since it is larger than the sum of its proper divisors (80611736).

161223466 is an equidigital number, since it uses as much as digits as its factorization.

161223466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80611735.

The product of its digits is 10368, while the sum is 31.

The square root of 161223466 is about 12697.3802809871. The cubic root of 161223466 is about 544.2637602323.

The spelling of 161223466 in words is "one hundred sixty-one million, two hundred twenty-three thousand, four hundred sixty-six".