161767973559 has 8 divisors (see below), whose sum is σ = 215964701440. Its totient is φ = 107708280696.

The previous prime is 161767973557. The next prime is 161767973593. The reversal of 161767973559 is 955379767161.

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

It is not a de Polignac number, because 161767973559 - 2¹ = 161767973557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161767973559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161767973557) 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, 34255999 + ... + 34260720.

It is an arithmetic number, because the mean of its divisors is an integer number (26995587680).

Almost surely, 2^161767973559 is an apocalyptic number.

161767973559 is a deficient number, since it is larger than the sum of its proper divisors (54196727881).

161767973559 is an equidigital number, since it uses as much as digits as its factorization.

161767973559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68517509.

The product of its digits is 75014100, while the sum is 66.

The spelling of 161767973559 in words is "one hundred sixty-one billion, seven hundred sixty-seven million, nine hundred seventy-three thousand, five hundred fifty-nine".