11664516642437 has 2 divisors, whose sum is σ = 11664516642438. Its totient is φ = 11664516642436.

The previous prime is 11664516642419. The next prime is 11664516642451. The reversal of 11664516642437 is 73424661546611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11160737511361 + 503779131076 = 3340769^2 + 709774^2 .

It is an emirp because it is prime and its reverse (73424661546611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11664516642437 - 2¹⁶ = 11664516576901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11664516647437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5832258321218 + 5832258321219.

It is an arithmetic number, because the mean of its divisors is an integer number (5832258321219).

Almost surely, 2^{11664516642437} is an apocalyptic number.

It is an amenable number.

11664516642437 is a deficient number, since it is larger than the sum of its proper divisors (1).

11664516642437 is an equidigital number, since it uses as much as digits as its factorization.

11664516642437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17418240, while the sum is 56.

The spelling of 11664516642437 in words is "eleven trillion, six hundred sixty-four billion, five hundred sixteen million, six hundred forty-two thousand, four hundred thirty-seven".