66737406700637 has 2 divisors, whose sum is σ = 66737406700638. Its totient is φ = 66737406700636.

The previous prime is 66737406700603. The next prime is 66737406700673. The reversal of 66737406700637 is 73600760473766.

Together with next prime (66737406700673) 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., 45880383532036 + 20857023168601 = 6773506^2 + 4566949^2 .

It is a cyclic number.

It is not a de Polignac number, because 66737406700637 - 2⁸ = 66737406700381 is a prime.

It is a super-2 number, since 2×66737406700637² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66737406700637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66737406700537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33368703350318 + 33368703350319.

It is an arithmetic number, because the mean of its divisors is an integer number (33368703350319).

Almost surely, 2^{66737406700637} is an apocalyptic number.

It is an amenable number.

66737406700637 is a deficient number, since it is larger than the sum of its proper divisors (1).

66737406700637 is an equidigital number, since it uses as much as digits as its factorization.

66737406700637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112021056, while the sum is 62.

The spelling of 66737406700637 in words is "sixty-six trillion, seven hundred thirty-seven billion, four hundred six million, seven hundred thousand, six hundred thirty-seven".