66555698895 has 112 divisors (see below), whose sum is σ = 137374885440. Its totient is φ = 30309230592.

The previous prime is 66555698801. The next prime is 66555698999. The reversal of 66555698895 is 59889655566.

66555698895 is a `hidden beast` number, since 6 + 6 + 55 + 569 + 8 + 8 + 9 + 5 = 666.

It is not a de Polignac number, because 66555698895 - 2¹⁴ = 66555682511 is a prime.

It is a super-2 number, since 2×66555698895² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 6858687 + ... + 6868383.

Almost surely, 2^66555698895 is an apocalyptic number.

66555698895 is an abundant number, since it is smaller than the sum of its proper divisors (70819186545).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66555698895 is an equidigital number, since it uses as much as digits as its factorization.

66555698895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9996 (or 9981 counting only the distinct ones).

The product of its digits is 699840000, while the sum is 72.

The spelling of 66555698895 in words is "sixty-six billion, five hundred fifty-five million, six hundred ninety-eight thousand, eight hundred ninety-five".