11555603665 has 8 divisors (see below), whose sum is σ = 13972578048. Its totient is φ = 9173913840.

The previous prime is 11555603659. The next prime is 11555603671. The reversal of 11555603665 is 56630655511.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11555603659) and next prime (11555603671).

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

It is a de Polignac number, because none of the positive numbers 2^k-11555603665 is a prime.

It is a super-2 number, since 2×11555603665² (a number of 21 digits) contains 22 as substring.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 8820417 + ... + 8821726.

It is an arithmetic number, because the mean of its divisors is an integer number (1746572256).

Almost surely, 2^11555603665 is an apocalyptic number.

It is an amenable number.

11555603665 is a deficient number, since it is larger than the sum of its proper divisors (2416974383).

11555603665 is a wasteful number, since it uses less digits than its factorization.

11555603665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17642279.

The product of its (nonzero) digits is 405000, while the sum is 43.

The spelling of 11555603665 in words is "eleven billion, five hundred fifty-five million, six hundred three thousand, six hundred sixty-five".