161886285 has 48 divisors (see below), whose sum is σ = 314421120. Its totient is φ = 76360320.

The previous prime is 161886239. The next prime is 161886313. The reversal of 161886285 is 582688161.

161886285 is a `hidden beast` number, since 1 + 6 + 18 + 8 + 628 + 5 = 666.

It is not a de Polignac number, because 161886285 - 2⁷ = 161886157 is a prime.

It is a super-2 number, since 2×161886285² = 52414338542202450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161886285.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13896 + ... + 22734.

It is an arithmetic number, because the mean of its divisors is an integer number (6550440).

Almost surely, 2^161886285 is an apocalyptic number.

161886285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161886285 is a deficient number, since it is larger than the sum of its proper divisors (152534835).

161886285 is a wasteful number, since it uses less digits than its factorization.

161886285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8898 (or 8895 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 161886285 is about 12723.4541300702. The cubic root of 161886285 is about 545.0085962227.

It can be divided in two parts, 161 and 886285, that added together give a triangular number (886446 = T₁₃₃₁).

The spelling of 161886285 in words is "one hundred sixty-one million, eight hundred eighty-six thousand, two hundred eighty-five".