161579916029 has 4 divisors (see below), whose sum is σ = 184662761184. Its totient is φ = 138497070876.

The previous prime is 161579915933. The next prime is 161579916097. The reversal of 161579916029 is 920619975161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 920619975161 = 1327 ⋅693760343.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161579916029 is a prime.

It is a super-2 number, since 2×161579916029² (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 (161579916229) 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, 11541422567 + ... + 11541422580.

It is an arithmetic number, because the mean of its divisors is an integer number (46165690296).

Almost surely, 2^161579916029 is an apocalyptic number.

It is an amenable number.

161579916029 is a deficient number, since it is larger than the sum of its proper divisors (23082845155).

161579916029 is an equidigital number, since it uses as much as digits as its factorization.

161579916029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23082845154.

The product of its (nonzero) digits is 1837080, while the sum is 56.

The spelling of 161579916029 in words is "one hundred sixty-one billion, five hundred seventy-nine million, nine hundred sixteen thousand, twenty-nine".