6551798971556 has 24 divisors (see below), whose sum is σ = 11747305222296. Its totient is φ = 3195453358080.

The previous prime is 6551798971547. The next prime is 6551798971567.

6551798971556 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 2639845057600 + 3911953913956 = 1624760^2 + 1977866^2 .

It is a super-2 number, since 2×6551798971556² (a number of 26 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (74) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2449901 + ... + 4370996.

It is an arithmetic number, because the mean of its divisors is an integer number (489471050929).

Almost surely, 2^{6551798971556} is an apocalyptic number.

It is an amenable number.

6551798971556 is a deficient number, since it is larger than the sum of its proper divisors (5195506250740).

6551798971556 is a wasteful number, since it uses less digits than its factorization.

6551798971556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6826799 (or 6826797 counting only the distinct ones).

The product of its digits is 714420000, while the sum is 74.

The spelling of 6551798971556 in words is "six trillion, five hundred fifty-one billion, seven hundred ninety-eight million, nine hundred seventy-one thousand, five hundred fifty-six".