216869685 has 16 divisors (see below), whose sum is σ = 358957440. Its totient is φ = 111675200.

The previous prime is 216869677. The next prime is 216869699. The reversal of 216869685 is 586968612.

It is not a de Polignac number, because 216869685 - 2³ = 216869677 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 248841 + ... + 249710.

It is an arithmetic number, because the mean of its divisors is an integer number (22434840).

Almost surely, 2^216869685 is an apocalyptic number.

It is an amenable number.

216869685 is a deficient number, since it is larger than the sum of its proper divisors (142087755).

216869685 is a wasteful number, since it uses less digits than its factorization.

216869685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498588.

The product of its digits is 1244160, while the sum is 51.

The square root of 216869685 is about 14726.4960190807. The cubic root of 216869685 is about 600.8041855500.

The spelling of 216869685 in words is "two hundred sixteen million, eight hundred sixty-nine thousand, six hundred eighty-five".