161166639 has 4 divisors (see below), whose sum is σ = 214888856. Its totient is φ = 107444424.

The previous prime is 161166631. The next prime is 161166641. The reversal of 161166639 is 936661161.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 161166639 - 2³ = 161166631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161166597 and 161166606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161166631) 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, 26861104 + ... + 26861109.

It is an arithmetic number, because the mean of its divisors is an integer number (53722214).

Almost surely, 2^161166639 is an apocalyptic number.

161166639 is a deficient number, since it is larger than the sum of its proper divisors (53722217).

161166639 is an equidigital number, since it uses as much as digits as its factorization.

161166639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53722216.

The product of its digits is 34992, while the sum is 39.

The square root of 161166639 is about 12695.1423387058. The cubic root of 161166639 is about 544.1998065328.

The spelling of 161166639 in words is "one hundred sixty-one million, one hundred sixty-six thousand, six hundred thirty-nine".