161603287586 has 16 divisors (see below), whose sum is σ = 261826112184. Its totient is φ = 74364804864.

The previous prime is 161603287567. The next prime is 161603287633. The reversal of 161603287586 is 685782306161.

It can be written as a sum of positive squares in 4 ways, for example, as 118243138225 + 43360149361 = 343865^2 + 208231^2 .

It is a super-2 number, since 2×161603287586² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9213065 + ... + 9230588.

Almost surely, 2^161603287586 is an apocalyptic number.

161603287586 is a deficient number, since it is larger than the sum of its proper divisors (100222824598).

161603287586 is a wasteful number, since it uses less digits than its factorization.

161603287586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18444005.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 161603287586 in words is "one hundred sixty-one billion, six hundred three million, two hundred eighty-seven thousand, five hundred eighty-six".