161555160055 has 4 divisors (see below), whose sum is σ = 193866192072. Its totient is φ = 129244128040.

The previous prime is 161555160029. The next prime is 161555160061. The reversal of 161555160055 is 550061555161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 550061555161 = 240209 ⋅2289929.

It is not a de Polignac number, because 161555160055 - 2²³ = 161546771447 is a prime.

It is a super-2 number, since 2×161555160055² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16155516001 + ... + 16155516010.

It is an arithmetic number, because the mean of its divisors is an integer number (48466548018).

Almost surely, 2^161555160055 is an apocalyptic number.

161555160055 is a deficient number, since it is larger than the sum of its proper divisors (32311032017).

161555160055 is an equidigital number, since it uses as much as digits as its factorization.

161555160055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32311032016.

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 161555160055 in words is "one hundred sixty-one billion, five hundred fifty-five million, one hundred sixty thousand, fifty-five".