215161686 has 24 divisors (see below), whose sum is σ = 477555624. Its totient is φ = 69971040.

The previous prime is 215161679. The next prime is 215161717. The reversal of 215161686 is 686161512.

215161686 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215161686² = 92589102244725192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215161686.

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, 145036 + ... + 146511.

It is an arithmetic number, because the mean of its divisors is an integer number (19898151).

Almost surely, 2^215161686 is an apocalyptic number.

215161686 is an abundant number, since it is smaller than the sum of its proper divisors (262393938).

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

215161686 is a wasteful number, since it uses less digits than its factorization.

215161686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291596 (or 291593 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 215161686 is about 14668.3907092769. The cubic root of 215161686 is about 599.2227769753. Note that the first 3 decimals are identical.

The spelling of 215161686 in words is "two hundred fifteen million, one hundred sixty-one thousand, six hundred eighty-six".