1226861651836 has 12 divisors (see below), whose sum is σ = 2151989350560. Its totient is φ = 612007551680.

The previous prime is 1226861651801. The next prime is 1226861651849. The reversal of 1226861651836 is 6381561686221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355816621 + ... + 355820068.

It is an arithmetic number, because the mean of its divisors is an integer number (179332445880).

Almost surely, 2^{1226861651836} is an apocalyptic number.

It is an amenable number.

1226861651836 is a deficient number, since it is larger than the sum of its proper divisors (925127698724).

1226861651836 is a wasteful number, since it uses less digits than its factorization.

1226861651836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711637124 (or 711637122 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 55.

The spelling of 1226861651836 in words is "one trillion, two hundred twenty-six billion, eight hundred sixty-one million, six hundred fifty-one thousand, eight hundred thirty-six".