216696669 has 12 divisors (see below), whose sum is σ = 336101184. Its totient is φ = 123826584.

The previous prime is 216696643. The next prime is 216696677. The reversal of 216696669 is 966696612.

It is not a de Polignac number, because 216696669 - 2¹⁶ = 216631133 is a prime.

It is a super-2 number, since 2×216696669² = 93914892711391122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216696619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 736917 + ... + 737210.

It is an arithmetic number, because the mean of its divisors is an integer number (28008432).

Almost surely, 2^216696669 is an apocalyptic number.

It is an amenable number.

216696669 is a deficient number, since it is larger than the sum of its proper divisors (119404515).

216696669 is a wasteful number, since it uses less digits than its factorization.

216696669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474144 (or 1474137 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 51.

The square root of 216696669 is about 14720.6205371920. The cubic root of 216696669 is about 600.6443716165.

The spelling of 216696669 in words is "two hundred sixteen million, six hundred ninety-six thousand, six hundred sixty-nine".