216530138664009 has 24 divisors (see below), whose sum is σ = 314868581164800. Its totient is φ = 143382913947168.

The previous prime is 216530138663981. The next prime is 216530138664013. The reversal of 216530138664009 is 900466831035612.

216530138664009 is a `hidden beast` number, since 2 + 1 + 6 + 530 + 1 + 3 + 8 + 66 + 40 + 0 + 9 = 666.

It is not a de Polignac number, because 216530138664009 - 2¹⁷ = 216530138532937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216530138662009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117910834 + ... + 119733140.

It is an arithmetic number, because the mean of its divisors is an integer number (13119524215200).

Almost surely, 2^{216530138664009} is an apocalyptic number.

It is an amenable number.

216530138664009 is a deficient number, since it is larger than the sum of its proper divisors (98338442500791).

216530138664009 is a wasteful number, since it uses less digits than its factorization.

216530138664009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911069 (or 1911066 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 216530138664009 in words is "two hundred sixteen trillion, five hundred thirty billion, one hundred thirty-eight million, six hundred sixty-four thousand, nine".