161477774161 has 16 divisors (see below), whose sum is σ = 191823134400. Its totient is φ = 134276184000.

The previous prime is 161477774153. The next prime is 161477774189.

161477774161 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 161477774161 - 2³ = 161477774153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161477774099 and 161477774108.

It is not an unprimeable number, because it can be changed into a prime (161477774111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13314990 + ... + 13327111.

It is an arithmetic number, because the mean of its divisors is an integer number (11988945900).

Almost surely, 2^161477774161 is an apocalyptic number.

161477774161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161477774161 is a deficient number, since it is larger than the sum of its proper divisors (30345360239).

161477774161 is a wasteful number, since it uses less digits than its factorization.

161477774161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26642160.

The product of its digits is 1382976, while the sum is 52.

The spelling of 161477774161 in words is "one hundred sixty-one billion, four hundred seventy-seven million, seven hundred seventy-four thousand, one hundred sixty-one".