161201639933 has 2 divisors, whose sum is σ = 161201639934. Its totient is φ = 161201639932.

The previous prime is 161201639917. The next prime is 161201639957. The reversal of 161201639933 is 339936102161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106247965849 + 54953674084 = 325957^2 + 234422^2 .

It is an emirp because it is prime and its reverse (339936102161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161201639933 - 2⁴ = 161201639917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161201659933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80600819966 + 80600819967.

It is an arithmetic number, because the mean of its divisors is an integer number (80600819967).

Almost surely, 2^161201639933 is an apocalyptic number.

It is an amenable number.

161201639933 is a deficient number, since it is larger than the sum of its proper divisors (1).

161201639933 is an equidigital number, since it uses as much as digits as its factorization.

161201639933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 44.

The spelling of 161201639933 in words is "one hundred sixty-one billion, two hundred one million, six hundred thirty-nine thousand, nine hundred thirty-three".