161863818109056 has 96 divisors (see below), whose sum is σ = 532319997081600. Its totient is φ = 46246805171712.

The previous prime is 161863818108991. The next prime is 161863818109061. The reversal of 161863818109056 is 650901818368161.

161863818109056 is a `hidden beast` number, since 1 + 618 + 6 + 3 + 8 + 1 + 8 + 1 + 0 + 9 + 0 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-3 number, since 3×161863818109056³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 161863818108984 and 161863818109002.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10036190976 + ... + 10036207103.

It is an arithmetic number, because the mean of its divisors is an integer number (5544999969600).

Almost surely, 2^{161863818109056} is an apocalyptic number.

161863818109056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161863818109056 is an abundant number, since it is smaller than the sum of its proper divisors (370456178972544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161863818109056 is a wasteful number, since it uses less digits than its factorization.

161863818109056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20072398106 (or 20072398091 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 63.

The spelling of 161863818109056 in words is "one hundred sixty-one trillion, eight hundred sixty-three billion, eight hundred eighteen million, one hundred nine thousand, fifty-six".