216571663467 has 12 divisors (see below), whose sum is σ = 320850491320. Its totient is φ = 144379496880.

The previous prime is 216571663439. The next prime is 216571663493. The reversal of 216571663467 is 764366175612.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

216571663467 is a `hidden beast` number, since 2 + 1 + 6 + 571 + 6 + 6 + 3 + 4 + 67 = 666.

It is not a de Polignac number, because 216571663467 - 2¹⁹ = 216571139179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216571663667) 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, 2373367 + ... + 2462927.

Almost surely, 2^216571663467 is an apocalyptic number.

216571663467 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

216571663467 is a deficient number, since it is larger than the sum of its proper divisors (104278827853).

216571663467 is an frugal number, since it uses more digits than its factorization.

216571663467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179131 (or 89564 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The spelling of 216571663467 in words is "two hundred sixteen billion, five hundred seventy-one million, six hundred sixty-three thousand, four hundred sixty-seven".