66511175503 has 2 divisors, whose sum is σ = 66511175504. Its totient is φ = 66511175502.

The previous prime is 66511175501. The next prime is 66511175593. The reversal of 66511175503 is 30557111566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66511175503 - 2¹ = 66511175501 is a prime.

Together with 66511175501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66511175501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33255587751 + 33255587752.

It is an arithmetic number, because the mean of its divisors is an integer number (33255587752).

Almost surely, 2^66511175503 is an apocalyptic number.

66511175503 is a deficient number, since it is larger than the sum of its proper divisors (1).

66511175503 is an equidigital number, since it uses as much as digits as its factorization.

66511175503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94500, while the sum is 40.

The spelling of 66511175503 in words is "sixty-six billion, five hundred eleven million, one hundred seventy-five thousand, five hundred three".