161780885 has 8 divisors (see below), whose sum is σ = 221870976. Its totient is φ = 110935440.

The previous prime is 161780881. The next prime is 161780887. The reversal of 161780885 is 588087161.

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

It is not a de Polignac number, because 161780885 - 2² = 161780881 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 (161780881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2311121 + ... + 2311190.

It is an arithmetic number, because the mean of its divisors is an integer number (27733872).

Almost surely, 2^161780885 is an apocalyptic number.

It is an amenable number.

161780885 is a deficient number, since it is larger than the sum of its proper divisors (60090091).

161780885 is an equidigital number, since it uses as much as digits as its factorization.

161780885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4622323.

The product of its (nonzero) digits is 107520, while the sum is 44.

The square root of 161780885 is about 12719.3114986622. The cubic root of 161780885 is about 544.8902901799.

The spelling of 161780885 in words is "one hundred sixty-one million, seven hundred eighty thousand, eight hundred eighty-five".