667216207237 has 2 divisors, whose sum is σ = 667216207238. Its totient is φ = 667216207236.

The previous prime is 667216207223. The next prime is 667216207283. The reversal of 667216207237 is 732702612766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517355087076 + 149861120161 = 719274^2 + 387119^2 .

It is a cyclic number.

It is not a de Polignac number, because 667216207237 - 2³⁵ = 632856468869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667216207837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333608103618 + 333608103619.

It is an arithmetic number, because the mean of its divisors is an integer number (333608103619).

Almost surely, 2^667216207237 is an apocalyptic number.

It is an amenable number.

667216207237 is a deficient number, since it is larger than the sum of its proper divisors (1).

667216207237 is an equidigital number, since it uses as much as digits as its factorization.

667216207237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 49.

The spelling of 667216207237 in words is "six hundred sixty-seven billion, two hundred sixteen million, two hundred seven thousand, two hundred thirty-seven".