161959563364 has 27 divisors (see below), whose sum is σ = 292912171923. Its totient is φ = 78355457400.

The previous prime is 161959563347. The next prime is 161959563371. The reversal of 161959563364 is 463365959161.

It is a happy number.

The square root of 161959563364 is 402442.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161959563299 and 161959563308.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 24948159 + ... + 24954649.

Almost surely, 2^161959563364 is an apocalyptic number.

161959563364 is the 402442-nd square number.

It is an amenable number.

161959563364 is a deficient number, since it is larger than the sum of its proper divisors (130952608559).

161959563364 is an frugal number, since it uses more digits than its factorization.

161959563364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13048 (or 6524 counting only the distinct ones).

The product of its digits is 15746400, while the sum is 58.

The spelling of 161959563364 in words is "one hundred sixty-one billion, nine hundred fifty-nine million, five hundred sixty-three thousand, three hundred sixty-four".