6555555561556 has 12 divisors (see below), whose sum is σ = 11484870775168. Its totient is φ = 3274163911512.

The previous prime is 6555555561521. The next prime is 6555555561559. The reversal of 6555555561556 is 6551655555556.

It is a super-2 number, since 2×6555555561556² (a number of 26 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555555561559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 903463236 + ... + 903470491.

Almost surely, 2^{6555555561556} is an apocalyptic number.

It is an amenable number.

6555555561556 is a deficient number, since it is larger than the sum of its proper divisors (4929315213612).

6555555561556 is a wasteful number, since it uses less digits than its factorization.

6555555561556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806934638 (or 1806934636 counting only the distinct ones).

The product of its digits is 421875000, while the sum is 64.

The spelling of 6555555561556 in words is "six trillion, five hundred fifty-five billion, five hundred fifty-five million, five hundred sixty-one thousand, five hundred fifty-six".