161555115393 has 24 divisors (see below), whose sum is σ = 270674675648. Its totient is φ = 90939337632.

The previous prime is 161555115383. The next prime is 161555115443. The reversal of 161555115393 is 393511555161.

It is a happy number.

161555115393 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 551 + 1 + 5 + 3 + 93 = 666.

It is not a de Polignac number, because 161555115393 - 2⁹ = 161555114881 is a prime.

It is a super-2 number, since 2×161555115393² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161555115383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19132846 + ... + 19141287.

Almost surely, 2^161555115393 is an apocalyptic number.

It is an amenable number.

161555115393 is a deficient number, since it is larger than the sum of its proper divisors (109119560255).

161555115393 is a wasteful number, since it uses less digits than its factorization.

161555115393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38274213 (or 38274210 counting only the distinct ones).

The product of its digits is 303750, while the sum is 45.

The spelling of 161555115393 in words is "one hundred sixty-one billion, five hundred fifty-five million, one hundred fifteen thousand, three hundred ninety-three".