161398016 has 36 divisors (see below), whose sum is σ = 346954692. Its totient is φ = 74489856.

The previous prime is 161398007. The next prime is 161398019. The reversal of 161398016 is 610893161.

It can be written as a sum of positive squares in 2 ways, for example, as 24601600 + 136796416 = 4960^2 + 11696^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161398019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20921 + ... + 27576.

Almost surely, 2^161398016 is an apocalyptic number.

161398016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161398016 is an abundant number, since it is smaller than the sum of its proper divisors (185556676).

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

161398016 is an equidigital number, since it uses as much as digits as its factorization.

161398016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48526 (or 48512 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 161398016 is about 12704.2518866716. The cubic root of 161398016 is about 544.4601067023.

The spelling of 161398016 in words is "one hundred sixty-one million, three hundred ninety-eight thousand, sixteen".