161641979933 has 48 divisors (see below), whose sum is σ = 204948506880. Its totient is φ = 126711535104.

The previous prime is 161641979921. The next prime is 161641979969. The reversal of 161641979933 is 339979146161.

It is not a de Polignac number, because 161641979933 - 2¹⁰ = 161641978909 is a prime.

It is a super-2 number, since 2×161641979933² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161641969933) 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 47 ways as a sum of consecutive naturals, for example, 3342341 + ... + 3390357.

It is an arithmetic number, because the mean of its divisors is an integer number (4269760560).

Almost surely, 2^161641979933 is an apocalyptic number.

It is an amenable number.

161641979933 is a deficient number, since it is larger than the sum of its proper divisors (43306526947).

161641979933 is a wasteful number, since it uses less digits than its factorization.

161641979933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48186 (or 48179 counting only the distinct ones).

The product of its digits is 6613488, while the sum is 59.

The spelling of 161641979933 in words is "one hundred sixty-one billion, six hundred forty-one million, nine hundred seventy-nine thousand, nine hundred thirty-three".