161105210555 has 32 divisors (see below), whose sum is σ = 195994681344. Its totient is φ = 127119597696.

The previous prime is 161105210537. The next prime is 161105210557. The reversal of 161105210555 is 555012501161.

It is a cyclic number.

It is not a de Polignac number, because 161105210555 - 2¹² = 161105206459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161105210557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101771294 + ... + 101772876.

It is an arithmetic number, because the mean of its divisors is an integer number (6124833792).

Almost surely, 2^161105210555 is an apocalyptic number.

161105210555 is a deficient number, since it is larger than the sum of its proper divisors (34889470789).

161105210555 is a wasteful number, since it uses less digits than its factorization.

161105210555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555.

The product of its (nonzero) digits is 7500, while the sum is 32.

The spelling of 161105210555 in words is "one hundred sixty-one billion, one hundred five million, two hundred ten thousand, five hundred fifty-five".