161263155698 has 6 divisors (see below), whose sum is σ = 241895585421. Its totient is φ = 80631293892.

The previous prime is 161263155689. The next prime is 161263155701. The reversal of 161263155698 is 896551362161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 145623902449 + 15639253249 = 381607^2 + 125057^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=283957.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 425936 + ... + 709892.

Almost surely, 2^161263155698 is an apocalyptic number.

161263155698 is a deficient number, since it is larger than the sum of its proper divisors (80632429723).

161263155698 is an frugal number, since it uses more digits than its factorization.

161263155698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567916 (or 283959 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 53.

The spelling of 161263155698 in words is "one hundred sixty-one billion, two hundred sixty-three million, one hundred fifty-five thousand, six hundred ninety-eight".