66571993039 has 2 divisors, whose sum is σ = 66571993040. Its totient is φ = 66571993038.

The previous prime is 66571993031. The next prime is 66571993049. The reversal of 66571993039 is 93039917566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66571993039 - 2³ = 66571993031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66571993031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33285996519 + 33285996520.

It is an arithmetic number, because the mean of its divisors is an integer number (33285996520).

Almost surely, 2^66571993039 is an apocalyptic number.

66571993039 is a deficient number, since it is larger than the sum of its proper divisors (1).

66571993039 is an equidigital number, since it uses as much as digits as its factorization.

66571993039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8266860, while the sum is 58.

The spelling of 66571993039 in words is "sixty-six billion, five hundred seventy-one million, nine hundred ninety-three thousand, thirty-nine".