161291820471 has 8 divisors (see below), whose sum is σ = 218700773760. Its totient is φ = 105705373752.

The previous prime is 161291820461. The next prime is 161291820491. The reversal of 161291820471 is 174028192161.

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

It is not a de Polignac number, because 161291820471 - 2⁶ = 161291820407 is a prime.

It is a super-3 number, since 3×161291820471³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161291820421) 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, 455626435 + ... + 455626788.

It is an arithmetic number, because the mean of its divisors is an integer number (27337596720).

Almost surely, 2^161291820471 is an apocalyptic number.

161291820471 is a deficient number, since it is larger than the sum of its proper divisors (57408953289).

161291820471 is an equidigital number, since it uses as much as digits as its factorization.

161291820471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911253285.

The product of its (nonzero) digits is 48384, while the sum is 42.

The spelling of 161291820471 in words is "one hundred sixty-one billion, two hundred ninety-one million, eight hundred twenty thousand, four hundred seventy-one".