161403440611 has 4 divisors (see below), whose sum is σ = 184461074992. Its totient is φ = 138345806232.

The previous prime is 161403440609. The next prime is 161403440617. The reversal of 161403440611 is 116044304161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116044304161 = 1153 ⋅100645537.

It is a cyclic number.

It is not a de Polignac number, because 161403440611 - 2¹ = 161403440609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161403440617) 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, 11528817180 + ... + 11528817193.

It is an arithmetic number, because the mean of its divisors is an integer number (46115268748).

Almost surely, 2^161403440611 is an apocalyptic number.

161403440611 is a deficient number, since it is larger than the sum of its proper divisors (23057634381).

161403440611 is an equidigital number, since it uses as much as digits as its factorization.

161403440611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23057634380.

The product of its (nonzero) digits is 6912, while the sum is 31.

Adding to 161403440611 its reverse (116044304161), we get a palindrome (277447744772).

The spelling of 161403440611 in words is "one hundred sixty-one billion, four hundred three million, four hundred forty thousand, six hundred eleven".