161599563 has 8 divisors (see below), whose sum is σ = 239406800. Its totient is φ = 107733024.

The previous prime is 161599549. The next prime is 161599577. The reversal of 161599563 is 365995161.

161599563 is a `hidden beast` number, since 1 + 6 + 1 + 599 + 56 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (161599549) and next prime (161599577).

It is not a de Polignac number, because 161599563 - 2⁵ = 161599531 is a prime.

It is a super-2 number, since 2×161599563² = 52228837523581938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161599523) 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, 2992558 + ... + 2992611.

It is an arithmetic number, because the mean of its divisors is an integer number (29925850).

Almost surely, 2^161599563 is an apocalyptic number.

161599563 is a deficient number, since it is larger than the sum of its proper divisors (77807237).

161599563 is an equidigital number, since it uses as much as digits as its factorization.

161599563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5985178 (or 5985172 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 161599563 is about 12712.1816774305. The cubic root of 161599563 is about 544.6866453309.

The spelling of 161599563 in words is "one hundred sixty-one million, five hundred ninety-nine thousand, five hundred sixty-three".