1642335161 has 2 divisors, whose sum is σ = 1642335162. Its totient is φ = 1642335160.

The previous prime is 1642335157. The next prime is 1642335209. The reversal of 1642335161 is 1615332461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1642275625 + 59536 = 40525^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642335161 - 2² = 1642335157 is a prime.

It is not a weakly prime, because it can be changed into another prime (1642335061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821167580 + 821167581.

It is an arithmetic number, because the mean of its divisors is an integer number (821167581).

Almost surely, 2^1642335161 is an apocalyptic number.

It is an amenable number.

1642335161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642335161 is an equidigital number, since it uses as much as digits as its factorization.

1642335161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The square root of 1642335161 is about 40525.7345522570. The cubic root of 1642335161 is about 1179.8331567708.

The spelling of 1642335161 in words is "one billion, six hundred forty-two million, three hundred thirty-five thousand, one hundred sixty-one".