161779749984 has 84 divisors (see below), whose sum is σ = 477537440436. Its totient is φ = 53926575552.

The previous prime is 161779749959. The next prime is 161779749991. The reversal of 161779749984 is 489947977161.

161779749984 is a `hidden beast` number, since 1 + 61 + 7 + 79 + 7 + 499 + 8 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 3444174 + ... + 3490829.

It is an arithmetic number, because the mean of its divisors is an integer number (5684969529).

Almost surely, 2^161779749984 is an apocalyptic number.

It is an amenable number.

161779749984 is an abundant number, since it is smaller than the sum of its proper divisors (315757690452).

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

161779749984 is an frugal number, since it uses more digits than its factorization.

161779749984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6935031 (or 6935008 counting only the distinct ones).

The product of its digits is 192036096, while the sum is 72.

The spelling of 161779749984 in words is "one hundred sixty-one billion, seven hundred seventy-nine million, seven hundred forty-nine thousand, nine hundred eighty-four".