161863818108984 has 24 divisors (see below), whose sum is σ = 438381174045360. Its totient is φ = 53954606036304.

The previous prime is 161863818108959. The next prime is 161863818108991. The reversal of 161863818108984 is 489801818368161.

161863818108984 is a `hidden beast` number, since 1 + 6 + 1 + 86 + 381 + 8 + 10 + 89 + 84 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×161863818108984² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72), and also a Moran number because the ratio is a prime number: 2248108584847 = 161863818108984 / (1 + 6 + 1 + 8 + 6 + 3 + 8 + 1 + 8 + 1 + 0 + 8 + 9 + 8 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1124054292352 + ... + 1124054292495.

It is an arithmetic number, because the mean of its divisors is an integer number (18265882251890).

Almost surely, 2^{161863818108984} is an apocalyptic number.

It is an amenable number.

161863818108984 is an abundant number, since it is smaller than the sum of its proper divisors (276517355936376).

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

161863818108984 is a wasteful number, since it uses less digits than its factorization.

161863818108984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248108584859 (or 2248108584852 counting only the distinct ones).

The product of its (nonzero) digits is 127401984, while the sum is 72.

The spelling of 161863818108984 in words is "one hundred sixty-one trillion, eight hundred sixty-three billion, eight hundred eighteen million, one hundred eight thousand, nine hundred eighty-four".