216161868 has 48 divisors (see below), whose sum is σ = 575134560. Its totient is φ = 62598144.

The previous prime is 216161863. The next prime is 216161873. The reversal of 216161868 is 868161612.

216161868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (216161863) and next prime (216161873).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (216161861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38103 + ... + 43406.

It is an arithmetic number, because the mean of its divisors is an integer number (11981970).

Almost surely, 2^216161868 is an apocalyptic number.

It is an amenable number.

216161868 is an abundant number, since it is smaller than the sum of its proper divisors (358972692).

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

216161868 is a wasteful number, since it uses less digits than its factorization.

216161868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81546 (or 81544 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 216161868 is about 14702.4442865804. Note that the first 3 decimals coincide. The cubic root of 216161868 is about 600.1498403544.

The spelling of 216161868 in words is "two hundred sixteen million, one hundred sixty-one thousand, eight hundred sixty-eight".