6551556551556 has 48 divisors (see below), whose sum is σ = 15702486395904. Its totient is φ = 2124509769216.

The previous prime is 6551556551539. The next prime is 6551556551591.

It is a happy number.

6551556551556 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6551556551556² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6551556551556.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1857181 + ... + 4068443.

It is an arithmetic number, because the mean of its divisors is an integer number (327135133248).

Almost surely, 2^{6551556551556} is an apocalyptic number.

It is an amenable number.

6551556551556 is an abundant number, since it is smaller than the sum of its proper divisors (9150929844348).

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

6551556551556 is a wasteful number, since it uses less digits than its factorization.

6551556551556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2217980 (or 2217978 counting only the distinct ones).

The product of its digits is 84375000, while the sum is 60.

The spelling of 6551556551556 in words is "six trillion, five hundred fifty-one billion, five hundred fifty-six million, five hundred fifty-one thousand, five hundred fifty-six".