161886538 has 8 divisors (see below), whose sum is σ = 264905280. Its totient is φ = 73584780.

The previous prime is 161886499. The next prime is 161886551. The reversal of 161886538 is 835688161.

161886538 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3679218 + ... + 3679261.

It is an arithmetic number, because the mean of its divisors is an integer number (33113160).

Almost surely, 2^161886538 is an apocalyptic number.

161886538 is a deficient number, since it is larger than the sum of its proper divisors (103018742).

161886538 is a wasteful number, since it uses less digits than its factorization.

161886538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7358492.

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

The square root of 161886538 is about 12723.4640723350. The cubic root of 161886538 is about 545.0088801404.

The spelling of 161886538 in words is "one hundred sixty-one million, eight hundred eighty-six thousand, five hundred thirty-eight".