11555602556 has 12 divisors (see below), whose sum is σ = 20230785960. Its totient is φ = 5775378000.

The previous prime is 11555602547. The next prime is 11555602573. The reversal of 11555602556 is 65520655511.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 595070 + ... + 614181.

It is an arithmetic number, because the mean of its divisors is an integer number (1685898830).

Almost surely, 2^11555602556 is an apocalyptic number.

It is an amenable number.

11555602556 is a deficient number, since it is larger than the sum of its proper divisors (8675183404).

11555602556 is a wasteful number, since it uses less digits than its factorization.

11555602556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211644 (or 1211642 counting only the distinct ones).

The product of its (nonzero) digits is 225000, while the sum is 41.

The spelling of 11555602556 in words is "eleven billion, five hundred fifty-five million, six hundred two thousand, five hundred fifty-six".