161580853887 has 32 divisors (see below), whose sum is σ = 229786066944. Its totient is φ = 100643212800.

The previous prime is 161580853871. The next prime is 161580853933. The reversal of 161580853887 is 788358085161.

It is not a de Polignac number, because 161580853887 - 2⁴ = 161580853871 is a prime.

It is a super-2 number, since 2×161580853887² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161580853887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161580853487) 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 31 ways as a sum of consecutive naturals, for example, 4726837 + ... + 4760897.

It is an arithmetic number, because the mean of its divisors is an integer number (7180814592).

Almost surely, 2^161580853887 is an apocalyptic number.

161580853887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

161580853887 is a deficient number, since it is larger than the sum of its proper divisors (68205213057).

161580853887 is a wasteful number, since it uses less digits than its factorization.

161580853887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34759.

The product of its (nonzero) digits is 12902400, while the sum is 60.

The spelling of 161580853887 in words is "one hundred sixty-one billion, five hundred eighty million, eight hundred fifty-three thousand, eight hundred eighty-seven".