161809367577604 has 12 divisors (see below), whose sum is σ = 283173159937500. Its totient is φ = 80902750452608.

The previous prime is 161809367577601. The next prime is 161809367577707. The reversal of 161809367577604 is 406775763908161.

It can be written as a sum of positive squares in 2 ways, for example, as 150535231718400 + 11274135859204 = 12269280^2 + 3357698^2 .

It is not an unprimeable number, because it can be changed into a prime (161809367577601) 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, 483145729 + ... + 483480520.

It is an arithmetic number, because the mean of its divisors is an integer number (23597763328125).

Almost surely, 2^{161809367577604} is an apocalyptic number.

It is an amenable number.

161809367577604 is a deficient number, since it is larger than the sum of its proper divisors (121363792359896).

161809367577604 is a wasteful number, since it uses less digits than its factorization.

161809367577604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966668102 (or 966668100 counting only the distinct ones).

The product of its (nonzero) digits is 320060160, while the sum is 70.

The spelling of 161809367577604 in words is "one hundred sixty-one trillion, eight hundred nine billion, three hundred sixty-seven million, five hundred seventy-seven thousand, six hundred four".