161461971056 has 20 divisors (see below), whose sum is σ = 315869781552. Its totient is φ = 79947188736.

The previous prime is 161461971007. The next prime is 161461971227. The reversal of 161461971056 is 650179164161.

It is a self number, because there is not a number n which added to its sum of digits gives 161461971056.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 48985601 + ... + 48988896.

Almost surely, 2^161461971056 is an apocalyptic number.

161461971056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161461971056 is a deficient number, since it is larger than the sum of its proper divisors (154407810496).

161461971056 is a wasteful number, since it uses less digits than its factorization.

161461971056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97974608 (or 97974602 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 161461971056 in words is "one hundred sixty-one billion, four hundred sixty-one million, nine hundred seventy-one thousand, fifty-six".