161779433 has 4 divisors (see below), whose sum is σ = 170294160. Its totient is φ = 153264708.

The previous prime is 161779427. The next prime is 161779441. The reversal of 161779433 is 334977161.

161779433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161779433 - 2⁴ = 161779417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161779403) 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, 4257335 + ... + 4257372.

It is an arithmetic number, because the mean of its divisors is an integer number (42573540).

Almost surely, 2^161779433 is an apocalyptic number.

It is an amenable number.

161779433 is a deficient number, since it is larger than the sum of its proper divisors (8514727).

161779433 is an equidigital number, since it uses as much as digits as its factorization.

161779433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8514726.

The product of its digits is 95256, while the sum is 41.

The square root of 161779433 is about 12719.2544199729. The cubic root of 161779433 is about 544.8886600263. Note that the first 3 decimals are identical.

The spelling of 161779433 in words is "one hundred sixty-one million, seven hundred seventy-nine thousand, four hundred thirty-three".