66571165027 has 2 divisors, whose sum is σ = 66571165028. Its totient is φ = 66571165026.

The previous prime is 66571164941. The next prime is 66571165039. The reversal of 66571165027 is 72056117566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66571165027 - 2¹⁹ = 66570640739 is a prime.

It is not a weakly prime, because it can be changed into another prime (66571165097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33285582513 + 33285582514.

It is an arithmetic number, because the mean of its divisors is an integer number (33285582514).

Almost surely, 2^66571165027 is an apocalyptic number.

66571165027 is a deficient number, since it is larger than the sum of its proper divisors (1).

66571165027 is an equidigital number, since it uses as much as digits as its factorization.

66571165027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 66571165027 in words is "sixty-six billion, five hundred seventy-one million, one hundred sixty-five thousand, twenty-seven".