161617158619 has 8 divisors (see below), whose sum is σ = 185478151680. Its totient is φ = 137949372456.

The previous prime is 161617158557. The next prime is 161617158623. The reversal of 161617158619 is 916851716161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161617158619 - 2²¹ = 161615061467 is a prime.

It is a super-4 number, since 4×161617158619⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161617158629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48299929 + ... + 48303274.

It is an arithmetic number, because the mean of its divisors is an integer number (23184768960).

Almost surely, 2^161617158619 is an apocalyptic number.

161617158619 is a deficient number, since it is larger than the sum of its proper divisors (23860993061).

161617158619 is an equidigital number, since it uses as much as digits as its factorization.

161617158619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96603449.

The product of its digits is 544320, while the sum is 52.

The spelling of 161617158619 in words is "one hundred sixty-one billion, six hundred seventeen million, one hundred fifty-eight thousand, six hundred nineteen".