161631447701 has 2 divisors, whose sum is σ = 161631447702. Its totient is φ = 161631447700.

The previous prime is 161631447683. The next prime is 161631447751. The reversal of 161631447701 is 107744136161.

161631447701 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159384592900 + 2246854801 = 399230^2 + 47401^2 .

It is a cyclic number.

It is not a de Polignac number, because 161631447701 - 2¹⁰ = 161631446677 is a prime.

It is a super-2 number, since 2×161631447701² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161631447751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80815723850 + 80815723851.

It is an arithmetic number, because the mean of its divisors is an integer number (80815723851).

Almost surely, 2^161631447701 is an apocalyptic number.

It is an amenable number.

161631447701 is a deficient number, since it is larger than the sum of its proper divisors (1).

161631447701 is an equidigital number, since it uses as much as digits as its factorization.

161631447701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 161631447701 in words is "one hundred sixty-one billion, six hundred thirty-one million, four hundred forty-seven thousand, seven hundred one".