11555204866581 has 8 divisors (see below), whose sum is σ = 15456479822784. Its totient is φ = 7678699910720.

The previous prime is 11555204866567. The next prime is 11555204866589. The reversal of 11555204866581 is 18566840255511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11555204866581 - 2⁹ = 11555204866069 is a prime.

It is a super-2 number, since 2×11555204866581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555204866589) by changing a digit.

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, 6192498996 + ... + 6192500861.

It is an arithmetic number, because the mean of its divisors is an integer number (1932059977848).

Almost surely, 2^{11555204866581} is an apocalyptic number.

It is an amenable number.

11555204866581 is a deficient number, since it is larger than the sum of its proper divisors (3901274956203).

11555204866581 is a wasteful number, since it uses less digits than its factorization.

11555204866581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12385000171.

The product of its (nonzero) digits is 11520000, while the sum is 57.

The spelling of 11555204866581 in words is "eleven trillion, five hundred fifty-five billion, two hundred four million, eight hundred sixty-six thousand, five hundred eighty-one".