66442511537 has 2 divisors, whose sum is σ = 66442511538. Its totient is φ = 66442511536.

The previous prime is 66442511489. The next prime is 66442511563. The reversal of 66442511537 is 73511524466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57796487281 + 8646024256 = 240409^2 + 92984^2 .

It is a cyclic number.

It is not a de Polignac number, because 66442511537 - 2¹⁰ = 66442510513 is a prime.

It is not a weakly prime, because it can be changed into another prime (66442511587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33221255768 + 33221255769.

It is an arithmetic number, because the mean of its divisors is an integer number (33221255769).

Almost surely, 2^66442511537 is an apocalyptic number.

It is an amenable number.

66442511537 is a deficient number, since it is larger than the sum of its proper divisors (1).

66442511537 is an equidigital number, since it uses as much as digits as its factorization.

66442511537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 44.

The spelling of 66442511537 in words is "sixty-six billion, four hundred forty-two million, five hundred eleven thousand, five hundred thirty-seven".