161945916 has 36 divisors (see below), whose sum is σ = 415352616. Its totient is φ = 49074080.

The previous prime is 161945909. The next prime is 161945923. The reversal of 161945916 is 619549161.

161945916 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161945909) and next prime (161945923).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54315 + ... + 57218.

Almost surely, 2^161945916 is an apocalyptic number.

It is an amenable number.

161945916 is an abundant number, since it is smaller than the sum of its proper divisors (253406700).

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

161945916 is a wasteful number, since it uses less digits than its factorization.

161945916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111562 (or 111549 counting only the distinct ones).

The product of its digits is 58320, while the sum is 42.

The square root of 161945916 is about 12725.7972638259. The cubic root of 161945916 is about 545.0755061899.

The spelling of 161945916 in words is "one hundred sixty-one million, nine hundred forty-five thousand, nine hundred sixteen".