161887408211 has 16 divisors (see below), whose sum is σ = 168397802496. Its totient is φ = 155505000000.

The previous prime is 161887408187. The next prime is 161887408231. The reversal of 161887408211 is 112804788161.

It is a happy number.

161887408211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 161887408211 - 2¹⁸ = 161887146067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161887408231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2149136 + ... + 2223186.

It is an arithmetic number, because the mean of its divisors is an integer number (10524862656).

Almost surely, 2^161887408211 is an apocalyptic number.

161887408211 is a deficient number, since it is larger than the sum of its proper divisors (6510394285).

161887408211 is an equidigital number, since it uses as much as digits as its factorization.

161887408211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74914.

The product of its (nonzero) digits is 172032, while the sum is 47.

The spelling of 161887408211 in words is "one hundred sixty-one billion, eight hundred eighty-seven million, four hundred eight thousand, two hundred eleven".