161275673 has 8 divisors (see below), whose sum is σ = 177918216. Its totient is φ = 145238400.

The previous prime is 161275669. The next prime is 161275679. The reversal of 161275673 is 376572161.

It can be written as a sum of positive squares in 4 ways, for example, as 13337104 + 147938569 = 3652^2 + 12163^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161275673 - 2² = 161275669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161275679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150758 + ... + 151823.

It is an arithmetic number, because the mean of its divisors is an integer number (22239777).

Almost surely, 2^161275673 is an apocalyptic number.

161275673 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161275673 is a deficient number, since it is larger than the sum of its proper divisors (16642543).

161275673 is a wasteful number, since it uses less digits than its factorization.

161275673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302635.

The product of its digits is 52920, while the sum is 38.

The square root of 161275673 is about 12699.4359323554. The cubic root of 161275673 is about 544.3225012918.

The spelling of 161275673 in words is "one hundred sixty-one million, two hundred seventy-five thousand, six hundred seventy-three".