163549874569 has 9 divisors (see below), whose sum is σ = 173743675477. Its totient is φ = 153922823104.

The previous prime is 163549874561. The next prime is 163549874581. The reversal of 163549874569 is 965478945361.

The square root of 163549874569 is 404413.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 505125625 + 163044748944 = 22475^2 + 403788^2 .

It is not a de Polignac number, because 163549874569 - 2³ = 163549874561 is a prime.

It is a super-2 number, since 2×163549874569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163549874561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6863127 + ... + 6886915.

Almost surely, 2^163549874569 is an apocalyptic number.

163549874569 is the 404413-rd square number.

163549874569 is the 202207-th centered octagonal number.

It is an amenable number.

163549874569 is a deficient number, since it is larger than the sum of its proper divisors (10193800908).

163549874569 is an frugal number, since it uses more digits than its factorization.

163549874569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47612 (or 23806 counting only the distinct ones).

The product of its digits is 195955200, while the sum is 67.

The spelling of 163549874569 in words is "one hundred sixty-three billion, five hundred forty-nine million, eight hundred seventy-four thousand, five hundred sixty-nine".