161661016 has 32 divisors (see below), whose sum is σ = 332804880. Its totient is φ = 73008000.

The previous prime is 161660999. The next prime is 161661083. The reversal of 161661016 is 610166161.

It is a super-2 number, since 2×161661016² = 52268568188304512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7966 + ... + 19666.

Almost surely, 2^161661016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161661016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166402440).

161661016 is an abundant number, since it is smaller than the sum of its proper divisors (171143864).

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

161661016 is a wasteful number, since it uses less digits than its factorization.

161661016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11875 (or 11871 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 161661016 is about 12714.5985386877. The cubic root of 161661016 is about 544.7556809679.

The spelling of 161661016 in words is "one hundred sixty-one million, six hundred sixty-one thousand, sixteen".