161555416 has 32 divisors (see below), whose sum is σ = 338521680. Its totient is φ = 71641600.

The previous prime is 161555413. The next prime is 161555417. The reversal of 161555416 is 614555161.

It is a super-3 number, since 3×161555416³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161555413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18781 + ... + 25996.

Almost surely, 2^161555416 is an apocalyptic number.

It is an amenable number.

161555416 is an abundant number, since it is smaller than the sum of its proper divisors (176966264).

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

161555416 is a wasteful number, since it uses less digits than its factorization.

161555416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44835 (or 44831 counting only the distinct ones).

The product of its digits is 18000, while the sum is 34.

The square root of 161555416 is about 12710.4451534948. The cubic root of 161555416 is about 544.6370402641.

The spelling of 161555416 in words is "one hundred sixty-one million, five hundred fifty-five thousand, four hundred sixteen".