66571155487 has 2 divisors, whose sum is σ = 66571155488. Its totient is φ = 66571155486.

The previous prime is 66571155481. The next prime is 66571155517. The reversal of 66571155487 is 78455117566.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66571155487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66571155481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33285577743 + 33285577744.

It is an arithmetic number, because the mean of its divisors is an integer number (33285577744).

Almost surely, 2^66571155487 is an apocalyptic number.

66571155487 is a deficient number, since it is larger than the sum of its proper divisors (1).

66571155487 is an equidigital number, since it uses as much as digits as its factorization.

66571155487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056000, while the sum is 55.

The spelling of 66571155487 in words is "sixty-six billion, five hundred seventy-one million, one hundred fifty-five thousand, four hundred eighty-seven".