161589397840 has 80 divisors (see below), whose sum is σ = 404720846208. Its totient is φ = 59645219328.

The previous prime is 161589397811. The next prime is 161589397861. The reversal of 161589397840 is 48793985161.

161589397840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×161589397840² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3579087 + ... + 3623953.

Almost surely, 2^161589397840 is an apocalyptic number.

161589397840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161589397840 is an abundant number, since it is smaller than the sum of its proper divisors (243131448368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161589397840 is a wasteful number, since it uses less digits than its factorization.

161589397840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48356 (or 48350 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 61.

The spelling of 161589397840 in words is "one hundred sixty-one billion, five hundred eighty-nine million, three hundred ninety-seven thousand, eight hundred forty".