161171383791 has 8 divisors (see below), whose sum is σ = 234431103744. Its totient is φ = 97679626520.

The previous prime is 161171383781. The next prime is 161171383819. The reversal of 161171383791 is 197383171161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161171383791 - 2¹⁵ = 161171351023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161171383791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161171383781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2441990631 + ... + 2441990696.

It is an arithmetic number, because the mean of its divisors is an integer number (29303887968).

Almost surely, 2^161171383791 is an apocalyptic number.

161171383791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161171383791 is a deficient number, since it is larger than the sum of its proper divisors (73259719953).

161171383791 is a wasteful number, since it uses less digits than its factorization.

161171383791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4883981341.

The product of its digits is 190512, while the sum is 48.

The spelling of 161171383791 in words is "one hundred sixty-one billion, one hundred seventy-one million, three hundred eighty-three thousand, seven hundred ninety-one".