161580533859 has 8 divisors (see below), whose sum is σ = 239378568720. Its totient is φ = 107720355888.

The previous prime is 161580533843. The next prime is 161580533867. The reversal of 161580533859 is 958335085161.

161580533859 is a `hidden beast` number, since 1 + 6 + 1 + 58 + 0 + 533 + 8 + 59 = 666.

It is not a de Polignac number, because 161580533859 - 2⁴ = 161580533843 is a prime.

It is a super-4 number, since 4×161580533859⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (161580533899) 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, 2992232082 + ... + 2992232135.

It is an arithmetic number, because the mean of its divisors is an integer number (29922321090).

Almost surely, 2^161580533859 is an apocalyptic number.

161580533859 is a deficient number, since it is larger than the sum of its proper divisors (77798034861).

161580533859 is an equidigital number, since it uses as much as digits as its factorization.

161580533859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5984464226 (or 5984464220 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 54.

The spelling of 161580533859 in words is "one hundred sixty-one billion, five hundred eighty million, five hundred thirty-three thousand, eight hundred fifty-nine".