66137431673 has 2 divisors, whose sum is σ = 66137431674. Its totient is φ = 66137431672.

The previous prime is 66137431637. The next prime is 66137431747. The reversal of 66137431673 is 37613473166.

Together with previous prime (66137431637) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63949811689 + 2187619984 = 252883^2 + 46772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66137431673 is a prime.

It is a super-4 number, since 4×66137431673⁴ (a number of 44 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (66137433673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33068715836 + 33068715837.

It is an arithmetic number, because the mean of its divisors is an integer number (33068715837).

Almost surely, 2^66137431673 is an apocalyptic number.

It is an amenable number.

66137431673 is a deficient number, since it is larger than the sum of its proper divisors (1).

66137431673 is an equidigital number, since it uses as much as digits as its factorization.

66137431673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 47.

The spelling of 66137431673 in words is "sixty-six billion, one hundred thirty-seven million, four hundred thirty-one thousand, six hundred seventy-three".