66670531523 has 2 divisors, whose sum is σ = 66670531524. Its totient is φ = 66670531522.

The previous prime is 66670531489. The next prime is 66670531637. The reversal of 66670531523 is 32513507666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66670531523 is a prime.

It is not a weakly prime, because it can be changed into another prime (66670561523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335265761 + 33335265762.

It is an arithmetic number, because the mean of its divisors is an integer number (33335265762).

Almost surely, 2^66670531523 is an apocalyptic number.

66670531523 is a deficient number, since it is larger than the sum of its proper divisors (1).

66670531523 is an equidigital number, since it uses as much as digits as its factorization.

66670531523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 44.

The spelling of 66670531523 in words is "sixty-six billion, six hundred seventy million, five hundred thirty-one thousand, five hundred twenty-three".