66501066487 has 2 divisors, whose sum is σ = 66501066488. Its totient is φ = 66501066486.

The previous prime is 66501066479. The next prime is 66501066509. The reversal of 66501066487 is 78466010566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66501066487 - 2³ = 66501066479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66501066487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66501036487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250533243 + 33250533244.

It is an arithmetic number, because the mean of its divisors is an integer number (33250533244).

Almost surely, 2^66501066487 is an apocalyptic number.

66501066487 is a deficient number, since it is larger than the sum of its proper divisors (1).

66501066487 is an equidigital number, since it uses as much as digits as its factorization.

66501066487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 66501066487 in words is "sixty-six billion, five hundred one million, sixty-six thousand, four hundred eighty-seven".