161913658819 has 16 divisors (see below), whose sum is σ = 177697753344. Its totient is φ = 146307431200.

The previous prime is 161913658813. The next prime is 161913658853. The reversal of 161913658819 is 918856319161.

It is a cyclic number.

It is not a de Polignac number, because 161913658819 - 2³ = 161913658811 is a prime.

It is a super-2 number, since 2×161913658819² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161913658811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10517802 + ... + 10533184.

It is an arithmetic number, because the mean of its divisors is an integer number (11106109584).

Almost surely, 2^161913658819 is an apocalyptic number.

161913658819 is a deficient number, since it is larger than the sum of its proper divisors (15784094525).

161913658819 is a wasteful number, since it uses less digits than its factorization.

161913658819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21098.

The product of its digits is 2799360, while the sum is 58.

The spelling of 161913658819 in words is "one hundred sixty-one billion, nine hundred thirteen million, six hundred fifty-eight thousand, eight hundred nineteen".