161736885 has 16 divisors (see below), whose sum is σ = 287532480. Its totient is φ = 86259600.

The previous prime is 161736881. The next prime is 161736901. The reversal of 161736885 is 588637161.

It is not a de Polignac number, because 161736885 - 2² = 161736881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161736885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161736881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598891 + ... + 599160.

It is an arithmetic number, because the mean of its divisors is an integer number (17970780).

Almost surely, 2^161736885 is an apocalyptic number.

161736885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161736885 is a deficient number, since it is larger than the sum of its proper divisors (125795595).

161736885 is a wasteful number, since it uses less digits than its factorization.

161736885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198065 (or 1198059 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 161736885 is about 12717.5817276713. The cubic root of 161736885 is about 544.8408872552.

The spelling of 161736885 in words is "one hundred sixty-one million, seven hundred thirty-six thousand, eight hundred eighty-five".