161343721404 has 18 divisors (see below), whose sum is σ = 407841073640. Its totient is φ = 53781240456.

The previous prime is 161343721369. The next prime is 161343721423. The reversal of 161343721404 is 404127343161.

161343721404 is a `hidden beast` number, since 1 + 6 + 1 + 3 + 437 + 214 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4481770039 = 161343721404 / (1 + 6 + 1 + 3 + 4 + 3 + 7 + 2 + 1 + 4 + 0 + 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, 2240884984 + ... + 2240885055.

Almost surely, 2^161343721404 is an apocalyptic number.

It is an amenable number.

161343721404 is an abundant number, since it is smaller than the sum of its proper divisors (246497352236).

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

161343721404 is a wasteful number, since it uses less digits than its factorization.

161343721404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4481770049 (or 4481770044 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 161343721404 in words is "one hundred sixty-one billion, three hundred forty-three million, seven hundred twenty-one thousand, four hundred four".