161970898805 has 8 divisors (see below), whose sum is σ = 194367735000. Its totient is φ = 129574948096.

The previous prime is 161970898757. The next prime is 161970898813. The reversal of 161970898805 is 508898079161.

It can be written as a sum of positive squares in 4 ways, for example, as 34426204849 + 127544693956 = 185543^2 + 357134^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161970898805 - 2⁸ = 161970898549 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 287321 + ... + 637569.

It is an arithmetic number, because the mean of its divisors is an integer number (24295966875).

Almost surely, 2^161970898805 is an apocalyptic number.

It is an amenable number.

161970898805 is a deficient number, since it is larger than the sum of its proper divisors (32396836195).

161970898805 is an equidigital number, since it uses as much as digits as its factorization.

161970898805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442743.

The product of its (nonzero) digits is 8709120, while the sum is 62.

The spelling of 161970898805 in words is "one hundred sixty-one billion, nine hundred seventy million, eight hundred ninety-eight thousand, eight hundred five".