161562998601 has 21 divisors (see below), whose sum is σ = 242249959101. Its totient is φ = 107701430652.

The previous prime is 161562998579. The next prime is 161562998659. The reversal of 161562998601 is 106899265161.

The square root of 161562998601 is 401949.

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

161562998601 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 6 + 29 + 9 + 8 + 601 = 666.

It is not a de Polignac number, because 161562998601 - 2¹³ = 161562990409 is a prime.

It is a super-2 number, since 2×161562998601² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161562994601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 10845180 + ... + 10860066.

Almost surely, 2^161562998601 is an apocalyptic number.

161562998601 is the 401949-th square number.

161562998601 is the 200975-th centered octagonal number.

It is an amenable number.

161562998601 is a deficient number, since it is larger than the sum of its proper divisors (80686960500).

161562998601 is an frugal number, since it uses more digits than its factorization.

161562998601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29792 (or 14890 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 161562998601 in words is "one hundred sixty-one billion, five hundred sixty-two million, nine hundred ninety-eight thousand, six hundred one".