161133944855 has 32 divisors (see below), whose sum is σ = 209832033600. Its totient is φ = 118783756416.

The previous prime is 161133944843. The next prime is 161133944887. The reversal of 161133944855 is 558449331161.

It is not a de Polignac number, because 161133944855 - 2⁸ = 161133944599 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6435701 + ... + 6460689.

It is an arithmetic number, because the mean of its divisors is an integer number (6557251050).

Almost surely, 2^161133944855 is an apocalyptic number.

161133944855 is a deficient number, since it is larger than the sum of its proper divisors (48698088745).

161133944855 is an equidigital number, since it uses as much as digits as its factorization.

161133944855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25620 (or 25594 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 50.

The spelling of 161133944855 in words is "one hundred sixty-one billion, one hundred thirty-three million, nine hundred forty-four thousand, eight hundred fifty-five".