161698545 has 16 divisors (see below), whose sum is σ = 287464320. Its totient is φ = 86239152.

The previous prime is 161698529. The next prime is 161698549. The reversal of 161698545 is 545896161.

161698545 is a `hidden beast` number, since 1 + 6 + 16 + 98 + 545 = 666.

161698545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161698545 - 2⁴ = 161698529 is a prime.

It is a super-2 number, since 2×161698545² = 52292838910234050, which contains 22 as substring.

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

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 161698545.

It is not an unprimeable number, because it can be changed into a prime (161698549) 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, 598749 + ... + 599018.

It is an arithmetic number, because the mean of its divisors is an integer number (17966520).

Almost surely, 2^161698545 is an apocalyptic number.

161698545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161698545 is a deficient number, since it is larger than the sum of its proper divisors (125765775).

161698545 is a wasteful number, since it uses less digits than its factorization.

161698545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197781 (or 1197775 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 161698545 is about 12716.0742762851. The cubic root of 161698545 is about 544.7978320374.

The spelling of 161698545 in words is "one hundred sixty-one million, six hundred ninety-eight thousand, five hundred forty-five".