66580555508495 has 32 divisors (see below), whose sum is σ = 96249971865600. Its totient is φ = 43192174254336.

The previous prime is 66580555508491. The next prime is 66580555508507. The reversal of 66580555508495 is 59480555508566.

It is a cyclic number.

It is not a de Polignac number, because 66580555508495 - 2² = 66580555508491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66580555508491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69147134 + ... + 70103403.

It is an arithmetic number, because the mean of its divisors is an integer number (3007811620800).

Almost surely, 2^{66580555508495} is an apocalyptic number.

66580555508495 is a deficient number, since it is larger than the sum of its proper divisors (29669416357105).

66580555508495 is a wasteful number, since it uses less digits than its factorization.

66580555508495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139251287.

The product of its (nonzero) digits is 1296000000, while the sum is 71.

Adding to 66580555508495 its sum of digits (71), we get a palindrome (66580555508566).

The spelling of 66580555508495 in words is "sixty-six trillion, five hundred eighty billion, five hundred fifty-five million, five hundred eight thousand, four hundred ninety-five".