1672220161 has 2 divisors, whose sum is σ = 1672220162. Its totient is φ = 1672220160.

The previous prime is 1672220159. The next prime is 1672220171. The reversal of 1672220161 is 1610222761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1580539536 + 91680625 = 39756^2 + 9575^2 .

It is a cyclic number.

It is not a de Polignac number, because 1672220161 - 2¹ = 1672220159 is a prime.

Together with 1672220159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1672220111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836110080 + 836110081.

It is an arithmetic number, because the mean of its divisors is an integer number (836110081).

Almost surely, 2^1672220161 is an apocalyptic number.

It is an amenable number.

1672220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1672220161 is an equidigital number, since it uses as much as digits as its factorization.

1672220161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1672220161 is about 40892.7886185327. The cubic root of 1672220161 is about 1186.9465206629.

The spelling of 1672220161 in words is "one billion, six hundred seventy-two million, two hundred twenty thousand, one hundred sixty-one".