11555204866512 has 20 divisors (see below), whose sum is σ = 29850945905280. Its totient is φ = 3851734955488.

The previous prime is 11555204866493. The next prime is 11555204866567. The reversal of 11555204866512 is 21566840255511.

It is a happy number.

It is a super-2 number, since 2×11555204866512² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 120366717312 + ... + 120366717407.

It is an arithmetic number, because the mean of its divisors is an integer number (1492547295264).

Almost surely, 2^{11555204866512} is an apocalyptic number.

11555204866512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11555204866512 is an abundant number, since it is smaller than the sum of its proper divisors (18295741038768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11555204866512 is a wasteful number, since it uses less digits than its factorization.

11555204866512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240733434730 (or 240733434724 counting only the distinct ones).

The product of its (nonzero) digits is 2880000, while the sum is 51.

The spelling of 11555204866512 in words is "eleven trillion, five hundred fifty-five billion, two hundred four million, eight hundred sixty-six thousand, five hundred twelve".