66884581155 has 16 divisors (see below), whose sum is σ = 122303234304. Its totient is φ = 30575808480.

The previous prime is 66884581117. The next prime is 66884581219. The reversal of 66884581155 is 55118548866.

It is not a de Polignac number, because 66884581155 - 2⁸ = 66884580899 is a prime.

It is a super-2 number, since 2×66884581155² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66884581095 and 66884581104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318497901 + ... + 318498110.

It is an arithmetic number, because the mean of its divisors is an integer number (7643952144).

Almost surely, 2^66884581155 is an apocalyptic number.

66884581155 is a deficient number, since it is larger than the sum of its proper divisors (55418653149).

66884581155 is a wasteful number, since it uses less digits than its factorization.

66884581155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636996026.

The product of its digits is 9216000, while the sum is 57.

The spelling of 66884581155 in words is "sixty-six billion, eight hundred eighty-four million, five hundred eighty-one thousand, one hundred fifty-five".