11555204866615 has 4 divisors (see below), whose sum is σ = 13866245839944. Its totient is φ = 9244163893288.

The previous prime is 11555204866613. The next prime is 11555204866619. The reversal of 11555204866615 is 51666840255511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11555204866615 - 2¹ = 11555204866613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555204866613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1155520486657 + ... + 1155520486666.

It is an arithmetic number, because the mean of its divisors is an integer number (3466561459986).

Almost surely, 2^{11555204866615} is an apocalyptic number.

11555204866615 is a deficient number, since it is larger than the sum of its proper divisors (2311040973329).

11555204866615 is an equidigital number, since it uses as much as digits as its factorization.

11555204866615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311040973328.

The product of its (nonzero) digits is 8640000, while the sum is 55.

The spelling of 11555204866615 in words is "eleven trillion, five hundred fifty-five billion, two hundred four million, eight hundred sixty-six thousand, six hundred fifteen".