161428409989 has 16 divisors (see below), whose sum is σ = 203254091136. Its totient is φ = 124542936000.

The previous prime is 161428409971. The next prime is 161428410019. The reversal of 161428409989 is 989904824161.

It is not a de Polignac number, because 161428409989 - 2³⁵ = 127068671621 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 (161428409929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10370802 + ... + 10386355.

It is an arithmetic number, because the mean of its divisors is an integer number (12703380696).

Almost surely, 2^161428409989 is an apocalyptic number.

It is an amenable number.

161428409989 is a deficient number, since it is larger than the sum of its proper divisors (41825681147).

161428409989 is a wasteful number, since it uses less digits than its factorization.

161428409989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20757276.

The product of its (nonzero) digits is 8957952, while the sum is 61.

The spelling of 161428409989 in words is "one hundred sixty-one billion, four hundred twenty-eight million, four hundred nine thousand, nine hundred eighty-nine".