66531873503 has 2 divisors, whose sum is σ = 66531873504. Its totient is φ = 66531873502.

The previous prime is 66531873487. The next prime is 66531873517. The reversal of 66531873503 is 30537813566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66531873503 - 2⁴ = 66531873487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66531873593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33265936751 + 33265936752.

It is an arithmetic number, because the mean of its divisors is an integer number (33265936752).

Almost surely, 2^66531873503 is an apocalyptic number.

66531873503 is a deficient number, since it is larger than the sum of its proper divisors (1).

66531873503 is an equidigital number, since it uses as much as digits as its factorization.

66531873503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 66531873503 in words is "sixty-six billion, five hundred thirty-one million, eight hundred seventy-three thousand, five hundred three".