216530138664008 has 32 divisors (see below), whose sum is σ = 444391930247160. Its totient is φ = 98298675809280.

The previous prime is 216530138663981. The next prime is 216530138664013. The reversal of 216530138664008 is 800466831035612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 132266514515524 + 84263624148484 = 11500718^2 + 9179522^2 .

It is a super-2 number, since 2×216530138664008² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17065735985 + ... + 17065748672.

Almost surely, 2^{216530138664008} is an apocalyptic number.

It is an amenable number.

216530138664008 is an abundant number, since it is smaller than the sum of its proper divisors (227861791583152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216530138664008 is a wasteful number, since it uses less digits than its factorization.

216530138664008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34131484737 (or 34131484733 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 53.

The spelling of 216530138664008 in words is "two hundred sixteen trillion, five hundred thirty billion, one hundred thirty-eight million, six hundred sixty-four thousand, eight".