161585886 has 32 divisors (see below), whose sum is σ = 402916608. Its totient is φ = 41970240.

The previous prime is 161585869. The next prime is 161585891. The reversal of 161585886 is 688585161.

It is a super-2 number, since 2×161585886² = 52219997108809992, 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 15 ways as a sum of consecutive naturals, for example, 174415 + ... + 175338.

It is an arithmetic number, because the mean of its divisors is an integer number (12591144).

Almost surely, 2^161585886 is an apocalyptic number.

161585886 is an abundant number, since it is smaller than the sum of its proper divisors (241330722).

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

161585886 is a wasteful number, since it uses less digits than its factorization.

161585886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349776.

The product of its digits is 460800, while the sum is 48.

The square root of 161585886 is about 12711.6437174741. The cubic root of 161585886 is about 544.6712783557.

The spelling of 161585886 in words is "one hundred sixty-one million, five hundred eighty-five thousand, eight hundred eighty-six".