161406021729 has 8 divisors (see below), whose sum is σ = 215214787360. Its totient is φ = 107600635296.

The previous prime is 161406021719. The next prime is 161406021779. The reversal of 161406021729 is 927120604161.

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

It is not a de Polignac number, because 161406021729 - 2³² = 157111054433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161406021719) 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, 731164 + ... + 925965.

It is an arithmetic number, because the mean of its divisors is an integer number (26901848420).

Almost surely, 2^161406021729 is an apocalyptic number.

It is an amenable number.

161406021729 is a deficient number, since it is larger than the sum of its proper divisors (53808765631).

161406021729 is a wasteful number, since it uses less digits than its factorization.

161406021729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689599.

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 161406021729 in words is "one hundred sixty-one billion, four hundred six million, twenty-one thousand, seven hundred twenty-nine".