66673131533 has 2 divisors, whose sum is σ = 66673131534. Its totient is φ = 66673131532.

The previous prime is 66673131523. The next prime is 66673131557. The reversal of 66673131533 is 33513137666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62061770884 + 4611360649 = 249122^2 + 67907^2 .

It is a cyclic number.

It is not a de Polignac number, because 66673131533 - 2¹⁰ = 66673130509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66673131523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33336565766 + 33336565767.

It is an arithmetic number, because the mean of its divisors is an integer number (33336565767).

Almost surely, 2^66673131533 is an apocalyptic number.

It is an amenable number.

66673131533 is a deficient number, since it is larger than the sum of its proper divisors (1).

66673131533 is an equidigital number, since it uses as much as digits as its factorization.

66673131533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 44.

The spelling of 66673131533 in words is "sixty-six billion, six hundred seventy-three million, one hundred thirty-one thousand, five hundred thirty-three".