161006100505 has 16 divisors (see below), whose sum is σ = 193610349504. Its totient is φ = 128536349760.

The previous prime is 161006100503. The next prime is 161006100539. The reversal of 161006100505 is 505001600161.

It is not a de Polignac number, because 161006100505 - 2¹ = 161006100503 is a prime.

It is a super-2 number, since 2×161006100505² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161006100505.

It is not an unprimeable number, because it can be changed into a prime (161006100503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10650162 + ... + 10665268.

It is an arithmetic number, because the mean of its divisors is an integer number (12100646844).

Almost surely, 2^161006100505 is an apocalyptic number.

It is an amenable number.

161006100505 is a deficient number, since it is larger than the sum of its proper divisors (32604248999).

161006100505 is a wasteful number, since it uses less digits than its factorization.

161006100505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19416.

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 161006100505 its reverse (505001600161), we get a palindrome (666007700666).

The spelling of 161006100505 in words is "one hundred sixty-one billion, six million, one hundred thousand, five hundred five".