161739647999 has 8 divisors (see below), whose sum is σ = 164172176688. Its totient is φ = 159307663680.

The previous prime is 161739647987. The next prime is 161739648001. The reversal of 161739647999 is 999746937161.

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

It is a cyclic number.

It is not a de Polignac number, because 161739647999 - 2²⁰ = 161738599423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161739647939) 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, 483659 + ... + 746595.

It is an arithmetic number, because the mean of its divisors is an integer number (20521522086).

Almost surely, 2^161739647999 is an apocalyptic number.

161739647999 is a deficient number, since it is larger than the sum of its proper divisors (2432528689).

161739647999 is an equidigital number, since it uses as much as digits as its factorization.

161739647999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272185.

The product of its digits is 138883248, while the sum is 71.

The spelling of 161739647999 in words is "one hundred sixty-one billion, seven hundred thirty-nine million, six hundred forty-seven thousand, nine hundred ninety-nine".