161456674 has 4 divisors (see below), whose sum is σ = 242185014. Its totient is φ = 80728336.

The previous prime is 161456629. The next prime is 161456677. The reversal of 161456674 is 476654161.

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

It can be written as a sum of positive squares in only one way, i.e., 158583649 + 2873025 = 12593^2 + 1695^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (161456677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40364167 + ... + 40364170.

Almost surely, 2^161456674 is an apocalyptic number.

161456674 is a deficient number, since it is larger than the sum of its proper divisors (80728340).

161456674 is an equidigital number, since it uses as much as digits as its factorization.

161456674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80728339.

The product of its digits is 120960, while the sum is 40.

The square root of 161456674 is about 12706.5602741261. The cubic root of 161456674 is about 544.5260576838.

The spelling of 161456674 in words is "one hundred sixty-one million, four hundred fifty-six thousand, six hundred seventy-four".