161663676259989 has 4 divisors (see below), whose sum is σ = 215551568346656. Its totient is φ = 107775784173324.

The previous prime is 161663676259961. The next prime is 161663676259991. The reversal of 161663676259989 is 989952676366161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 161663676259989 - 2¹³ = 161663676251797 is a prime.

It is a super-2 number, since 2×161663676259989² (a number of 29 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 (161663676258989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26943946043329 + ... + 26943946043334.

It is an arithmetic number, because the mean of its divisors is an integer number (53887892086664).

Almost surely, 2^{161663676259989} is an apocalyptic number.

It is an amenable number.

161663676259989 is a deficient number, since it is larger than the sum of its proper divisors (53887892086667).

161663676259989 is an equidigital number, since it uses as much as digits as its factorization.

161663676259989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53887892086666.

The product of its digits is 9523422720, while the sum is 84.

The spelling of 161663676259989 in words is "one hundred sixty-one trillion, six hundred sixty-three billion, six hundred seventy-six million, two hundred fifty-nine thousand, nine hundred eighty-nine".