66106510493 has 2 divisors, whose sum is σ = 66106510494. Its totient is φ = 66106510492.

The previous prime is 66106510489. The next prime is 66106510531. The reversal of 66106510493 is 39401560166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65606675044 + 499835449 = 256138^2 + 22357^2 .

It is a cyclic number.

It is not a de Polignac number, because 66106510493 - 2² = 66106510489 is a prime.

It is a super-2 number, since 2×66106510493² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66106510493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66106510993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33053255246 + 33053255247.

It is an arithmetic number, because the mean of its divisors is an integer number (33053255247).

Almost surely, 2^66106510493 is an apocalyptic number.

It is an amenable number.

66106510493 is a deficient number, since it is larger than the sum of its proper divisors (1).

66106510493 is an equidigital number, since it uses as much as digits as its factorization.

66106510493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 66106510493 in words is "sixty-six billion, one hundred six million, five hundred ten thousand, four hundred ninety-three".