161611808941 has 4 divisors (see below), whose sum is σ = 176303791584. Its totient is φ = 146919826300.

The previous prime is 161611808927. The next prime is 161611808959. The reversal of 161611808941 is 149808116161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161611808941 - 2⁵ = 161611808909 is a prime.

It is a super-2 number, since 2×161611808941² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161611808891 and 161611808900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161611805941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7345991305 + ... + 7345991326.

It is an arithmetic number, because the mean of its divisors is an integer number (44075947896).

Almost surely, 2^161611808941 is an apocalyptic number.

161611808941 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161611808941 is a deficient number, since it is larger than the sum of its proper divisors (14691982643).

161611808941 is a wasteful number, since it uses less digits than its factorization.

161611808941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14691982642.

The product of its (nonzero) digits is 82944, while the sum is 46.

The spelling of 161611808941 in words is "one hundred sixty-one billion, six hundred eleven million, eight hundred eight thousand, nine hundred forty-one".