161785488871 has 8 divisors (see below), whose sum is σ = 171369321840. Its totient is φ = 152209104768.

The previous prime is 161785488833. The next prime is 161785488911. The reversal of 161785488871 is 178884587161.

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 161785488871 - 2⁷ = 161785488743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161785488071) 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, 1817461 + ... + 1904398.

It is an arithmetic number, because the mean of its divisors is an integer number (21421165230).

Almost surely, 2^161785488871 is an apocalyptic number.

161785488871 is a deficient number, since it is larger than the sum of its proper divisors (9583832969).

161785488871 is a wasteful number, since it uses less digits than its factorization.

161785488871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724433.

The product of its digits is 24084480, while the sum is 64.

The spelling of 161785488871 in words is "one hundred sixty-one billion, seven hundred eighty-five million, four hundred eighty-eight thousand, eight hundred seventy-one".