161858598719 has 4 divisors (see below), whose sum is σ = 161916346296. Its totient is φ = 161800851144.

The previous prime is 161858598691. The next prime is 161858598877. The reversal of 161858598719 is 917895858161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161858598719 - 2²⁰ = 161857550143 is a prime.

It is a super-2 number, since 2×161858598719² (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 (161858595719) 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, 28869584 + ... + 28875189.

It is an arithmetic number, because the mean of its divisors is an integer number (40479086574).

Almost surely, 2^161858598719 is an apocalyptic number.

161858598719 is a deficient number, since it is larger than the sum of its proper divisors (57747577).

161858598719 is an equidigital number, since it uses as much as digits as its factorization.

161858598719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57747576.

The product of its digits is 43545600, while the sum is 68.

The spelling of 161858598719 in words is "one hundred sixty-one billion, eight hundred fifty-eight million, five hundred ninety-eight thousand, seven hundred nineteen".