1226981566864 has 45 divisors (see below), whose sum is σ = 2456711902209. Its totient is φ = 593634296640.

The previous prime is 1226981566817. The next prime is 1226981566897. The reversal of 1226981566864 is 4686651896221.

It is a happy number.

The square root of 1226981566864 is 1107692.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 313443219600 + 913538347264 = 559860^2 + 955792^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1226981566796 and 1226981566805.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 137349342 + ... + 137358274.

Almost surely, 2^{1226981566864} is an apocalyptic number.

1226981566864 is the 1107692-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1226981566864

1226981566864 is an abundant number, since it is smaller than the sum of its proper divisors (1229730335345).

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

1226981566864 is an frugal number, since it uses more digits than its factorization.

1226981566864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17936 (or 8966 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 64.

Multiplying 1226981566864 by its sum of digits (64), we get a square (78526820279296 = 8861536²).

The spelling of 1226981566864 in words is "one trillion, two hundred twenty-six billion, nine hundred eighty-one million, five hundred sixty-six thousand, eight hundred sixty-four".