11005555665 has 64 divisors (see below), whose sum is σ = 19594358784. Its totient is φ = 5240325888.

The previous prime is 11005555663. The next prime is 11005555697. The reversal of 11005555665 is 56655550011.

It is not a de Polignac number, because 11005555665 - 2¹ = 11005555663 is a prime.

It is a super-2 number, since 2×11005555665² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (11005555661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 857284 + ... + 870026.

It is an arithmetic number, because the mean of its divisors is an integer number (306161856).

Almost surely, 2^11005555665 is an apocalyptic number.

11005555665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11005555665 is a deficient number, since it is larger than the sum of its proper divisors (8588803119).

11005555665 is a wasteful number, since it uses less digits than its factorization.

11005555665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12910.

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 11005555665 in words is "eleven billion, five million, five hundred fifty-five thousand, six hundred sixty-five".