161145406801 has 4 divisors (see below), whose sum is σ = 161148624052. Its totient is φ = 161142189552.

The previous prime is 161145406789. The next prime is 161145406867. The reversal of 161145406801 is 108604541161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 108604541161 = 1777 ⋅61116793.

It can be written as a sum of positive squares in 2 ways, for example, as 33782072401 + 127363334400 = 183799^2 + 356880^2 .

It is a cyclic number.

It is not a de Polignac number, because 161145406801 - 2¹⁷ = 161145275729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161145406601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1532286 + ... + 1634071.

It is an arithmetic number, because the mean of its divisors is an integer number (40287156013).

Almost surely, 2^161145406801 is an apocalyptic number.

It is an amenable number.

161145406801 is a deficient number, since it is larger than the sum of its proper divisors (3217251).

161145406801 is an equidigital number, since it uses as much as digits as its factorization.

161145406801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217250.

The product of its (nonzero) digits is 23040, while the sum is 37.

Adding to 161145406801 its reverse (108604541161), we get a palindrome (269749947962).

The spelling of 161145406801 in words is "one hundred sixty-one billion, one hundred forty-five million, four hundred six thousand, eight hundred one".