1361533540666 has 16 divisors (see below), whose sum is σ = 2201747653224. Its totient is φ = 627729433344.

The previous prime is 1361533540621. The next prime is 1361533540691. The reversal of 1361533540666 is 6660453351631.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 370125007641 + 991408533025 = 608379^2 + 995695^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27919435 + ... + 27968158.

Almost surely, 2^{1361533540666} is an apocalyptic number.

1361533540666 is a deficient number, since it is larger than the sum of its proper divisors (840214112558).

1361533540666 is a wasteful number, since it uses less digits than its factorization.

1361533540666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55888545.

The product of its (nonzero) digits is 3499200, while the sum is 49.

The spelling of 1361533540666 in words is "one trillion, three hundred sixty-one billion, five hundred thirty-three million, five hundred forty thousand, six hundred sixty-six".