161489083921 has 32 divisors (see below), whose sum is σ = 180272874240. Its totient is φ = 143434368000.

The previous prime is 161489083859. The next prime is 161489083927. The reversal of 161489083921 is 129380984161.

It is not a de Polignac number, because 161489083921 - 2¹⁵ = 161489051153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161489083927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61007020 + ... + 61009666.

It is an arithmetic number, because the mean of its divisors is an integer number (5633527320).

Almost surely, 2^161489083921 is an apocalyptic number.

161489083921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161489083921 is a deficient number, since it is larger than the sum of its proper divisors (18783790319).

161489083921 is a wasteful number, since it uses less digits than its factorization.

161489083921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3465.

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 161489083921 in words is "one hundred sixty-one billion, four hundred eighty-nine million, eighty-three thousand, nine hundred twenty-one".