161585616 has 20 divisors (see below), whose sum is σ = 417429632. Its totient is φ = 53861856.

The previous prime is 161585597. The next prime is 161585621. The reversal of 161585616 is 616585161.

It is a super-2 number, since 2×161585616² = 52219822596198912, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1683136 + ... + 1683231.

Almost surely, 2^161585616 is an apocalyptic number.

161585616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161585616 is an abundant number, since it is smaller than the sum of its proper divisors (255844016).

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

161585616 is a wasteful number, since it uses less digits than its factorization.

161585616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366378 (or 3366372 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The square root of 161585616 is about 12711.6330972853. The cubic root of 161585616 is about 544.6709749849.

The spelling of 161585616 in words is "one hundred sixty-one million, five hundred eighty-five thousand, six hundred sixteen".