161868853 has 4 divisors (see below), whose sum is σ = 164148768. Its totient is φ = 159588940.

The previous prime is 161868803. The next prime is 161868869. The reversal of 161868853 is 358868161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161868853 - 2²⁵ = 128314421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161868803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1139851 + ... + 1139992.

It is an arithmetic number, because the mean of its divisors is an integer number (41037192).

Almost surely, 2^161868853 is an apocalyptic number.

It is an amenable number.

161868853 is a deficient number, since it is larger than the sum of its proper divisors (2279915).

161868853 is an equidigital number, since it uses as much as digits as its factorization.

161868853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2279914.

The product of its digits is 276480, while the sum is 46.

The square root of 161868853 is about 12722.7690775240. The cubic root of 161868853 is about 544.9890332501.

The spelling of 161868853 in words is "one hundred sixty-one million, eight hundred sixty-eight thousand, eight hundred fifty-three".