161809048774 has 8 divisors (see below), whose sum is σ = 244940303520. Its totient is φ = 80162280936.

The previous prime is 161809048771. The next prime is 161809048801. The reversal of 161809048774 is 477840908161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161809048771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371121454 + ... + 371121889.

It is an arithmetic number, because the mean of its divisors is an integer number (30617537940).

Almost surely, 2^161809048774 is an apocalyptic number.

161809048774 is a deficient number, since it is larger than the sum of its proper divisors (83131254746).

161809048774 is a wasteful number, since it uses less digits than its factorization.

161809048774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742243454.

The product of its (nonzero) digits is 2709504, while the sum is 55.

The spelling of 161809048774 in words is "one hundred sixty-one billion, eight hundred nine million, forty-eight thousand, seven hundred seventy-four".