216161687 has 32 divisors (see below), whose sum is σ = 261072000. Its totient is φ = 178827264.

The previous prime is 216161669. The next prime is 216161711. The reversal of 216161687 is 786161612.

It is not a de Polignac number, because 216161687 - 2⁶ = 216161623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216161687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216161657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2228423 + ... + 2228519.

It is an arithmetic number, because the mean of its divisors is an integer number (8158500).

Almost surely, 2^216161687 is an apocalyptic number.

216161687 is a deficient number, since it is larger than the sum of its proper divisors (44910313).

216161687 is an frugal number, since it uses more digits than its factorization.

216161687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 266 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 216161687 is about 14702.4381311400. The cubic root of 216161687 is about 600.1496728455.

The spelling of 216161687 in words is "two hundred sixteen million, one hundred sixty-one thousand, six hundred eighty-seven".