161361616 has 20 divisors (see below), whose sum is σ = 336687652. Its totient is φ = 74474496.

The previous prime is 161361611. The next prime is 161361619. The reversal of 161361616 is 616163161.

161361616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 102010000 + 59351616 = 10100^2 + 7704^2 .

It is a super-2 number, since 2×161361616² = 52075142236262912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161361611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387681 + ... + 388096.

Almost surely, 2^161361616 is an apocalyptic number.

161361616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161361616 is an abundant number, since it is smaller than the sum of its proper divisors (175326036).

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

161361616 is a wasteful number, since it uses less digits than its factorization.

161361616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775798 (or 775792 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 161361616 is about 12702.8192146468. The cubic root of 161361616 is about 544.4191730353.

The spelling of 161361616 in words is "one hundred sixty-one million, three hundred sixty-one thousand, six hundred sixteen".