6615566056666 has 16 divisors (see below), whose sum is σ = 11342053097856. Its totient is φ = 2834971916976.

The previous prime is 6615566056663. The next prime is 6615566056669. The reversal of 6615566056666 is 6666506655166.

It is an interprime number because it is at equal distance from previous prime (6615566056663) and next prime (6615566056669).

It is a super-2 number, since 2×6615566056666² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6615566056598 and 6615566056607.

It is not an unprimeable number, because it can be changed into a prime (6615566056663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22404646 + ... + 22698001.

It is an arithmetic number, because the mean of its divisors is an integer number (708878318616).

Almost surely, 2^{6615566056666} is an apocalyptic number.

6615566056666 is a deficient number, since it is larger than the sum of its proper divisors (4726487041190).

6615566056666 is a wasteful number, since it uses less digits than its factorization.

6615566056666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45113133.

The product of its (nonzero) digits is 209952000, while the sum is 64.

The spelling of 6615566056666 in words is "six trillion, six hundred fifteen billion, five hundred sixty-six million, fifty-six thousand, six hundred sixty-six".