161888887173 has 16 divisors (see below), whose sum is σ = 238738430336. Its totient is φ = 96931391040.

The previous prime is 161888887159. The next prime is 161888887219. The reversal of 161888887173 is 371788888161.

It is not a de Polignac number, because 161888887173 - 2⁴ = 161888887157 is a prime.

It is a super-2 number, since 2×161888887173² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161888887073) 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, 56093113 + ... + 56095998.

It is an arithmetic number, because the mean of its divisors is an integer number (14921151896).

Almost surely, 2^161888887173 is an apocalyptic number.

161888887173 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161888887173 is a deficient number, since it is larger than the sum of its proper divisors (76849543163).

161888887173 is a wasteful number, since it uses less digits than its factorization.

161888887173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112189164.

The product of its digits is 28901376, while the sum is 66.

The spelling of 161888887173 in words is "one hundred sixty-one billion, eight hundred eighty-eight million, eight hundred eighty-seven thousand, one hundred seventy-three".