161355779 has 8 divisors (see below), whose sum is σ = 178464720. Its totient is φ = 144917856.

The previous prime is 161355773. The next prime is 161355827. The reversal of 161355779 is 977553161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161355779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161355773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167249 + ... + 168210.

It is an arithmetic number, because the mean of its divisors is an integer number (22308090).

Almost surely, 2^161355779 is an apocalyptic number.

161355779 is a deficient number, since it is larger than the sum of its proper divisors (17108941).

161355779 is a wasteful number, since it uses less digits than its factorization.

161355779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335509.

The product of its digits is 198450, while the sum is 44.

The square root of 161355779 is about 12702.5894604211. The cubic root of 161355779 is about 544.4126084567.

The spelling of 161355779 in words is "one hundred sixty-one million, three hundred fifty-five thousand, seven hundred seventy-nine".