6656605551556 has 24 divisors (see below), whose sum is σ = 11859008175000. Its totient is φ = 3268819471104.

The previous prime is 6656605551551. The next prime is 6656605551569. The reversal of 6656605551556 is 6551555066566.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 705542881156 + 5951062670400 = 839966^2 + 2439480^2 .

It is a super-2 number, since 2×6656605551556² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6656605551494 and 6656605551503.

It is not an unprimeable number, because it can be changed into a prime (6656605551551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62693031 + ... + 62799118.

It is an arithmetic number, because the mean of its divisors is an integer number (494125340625).

Almost surely, 2^{6656605551556} is an apocalyptic number.

It is an amenable number.

6656605551556 is a deficient number, since it is larger than the sum of its proper divisors (5202402623444).

6656605551556 is a wasteful number, since it uses less digits than its factorization.

6656605551556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125492391 (or 125492389 counting only the distinct ones).

The product of its (nonzero) digits is 121500000, while the sum is 61.

The spelling of 6656605551556 in words is "six trillion, six hundred fifty-six billion, six hundred five million, five hundred fifty-one thousand, five hundred fifty-six".