161887388847 has 8 divisors (see below), whose sum is σ = 215879830656. Its totient is φ = 107909936472.

The previous prime is 161887388807. The next prime is 161887388849. The reversal of 161887388847 is 748883788161.

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

It is not a de Polignac number, because 161887388847 - 2⁸ = 161887388591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161887388849) 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, 3722133 + ... + 3765374.

It is an arithmetic number, because the mean of its divisors is an integer number (26984978832).

Almost surely, 2^161887388847 is an apocalyptic number.

161887388847 is a deficient number, since it is larger than the sum of its proper divisors (53992441809).

161887388847 is an equidigital number, since it uses as much as digits as its factorization.

161887388847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7494717.

The product of its digits is 115605504, while the sum is 69.

The spelling of 161887388847 in words is "one hundred sixty-one billion, eight hundred eighty-seven million, three hundred eighty-eight thousand, eight hundred forty-seven".