1264661113556 has 24 divisors (see below), whose sum is σ = 2220670082400. Its totient is φ = 630184512672.

The previous prime is 1264661113543. The next prime is 1264661113571. The reversal of 1264661113556 is 6553111664621.

It is a self number, because there is not a number n which added to its sum of digits gives 1264661113556.

It is a congruent number.

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, 9417170 + ... + 9550518.

It is an arithmetic number, because the mean of its divisors is an integer number (92527920100).

Almost surely, 2^{1264661113556} is an apocalyptic number.

It is an amenable number.

1264661113556 is a deficient number, since it is larger than the sum of its proper divisors (956008968844).

1264661113556 is a wasteful number, since it uses less digits than its factorization.

1264661113556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141383 (or 141381 counting only the distinct ones).

The product of its digits is 777600, while the sum is 47.

The spelling of 1264661113556 in words is "one trillion, two hundred sixty-four billion, six hundred sixty-one million, one hundred thirteen thousand, five hundred fifty-six".