66145513554587 has 2 divisors, whose sum is σ = 66145513554588. Its totient is φ = 66145513554586.

The previous prime is 66145513554577. The next prime is 66145513554649. The reversal of 66145513554587 is 78545531554166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66145513554587 - 2²⁸ = 66145245119131 is a prime.

It is not a weakly prime, because it can be changed into another prime (66145513554517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33072756777293 + 33072756777294.

It is an arithmetic number, because the mean of its divisors is an integer number (33072756777294).

Almost surely, 2^{66145513554587} is an apocalyptic number.

66145513554587 is a deficient number, since it is larger than the sum of its proper divisors (1).

66145513554587 is an equidigital number, since it uses as much as digits as its factorization.

66145513554587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400000, while the sum is 65.

The spelling of 66145513554587 in words is "sixty-six trillion, one hundred forty-five billion, five hundred thirteen million, five hundred fifty-four thousand, five hundred eighty-seven".