11553256665 has 16 divisors (see below), whose sum is σ = 20539123200. Its totient is φ = 6161736816.

The previous prime is 11553256657. The next prime is 11553256667. The reversal of 11553256665 is 56665235511.

It is not a de Polignac number, because 11553256665 - 2³ = 11553256657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 11553256665.

It is not an unprimeable number, because it can be changed into a prime (11553256667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42789705 + ... + 42789974.

It is an arithmetic number, because the mean of its divisors is an integer number (1283695200).

Almost surely, 2^11553256665 is an apocalyptic number.

11553256665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11553256665 is a deficient number, since it is larger than the sum of its proper divisors (8985866535).

11553256665 is an equidigital number, since it uses as much as digits as its factorization.

11553256665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85579693 (or 85579687 counting only the distinct ones).

The product of its digits is 810000, while the sum is 45.

The spelling of 11553256665 in words is "eleven billion, five hundred fifty-three million, two hundred fifty-six thousand, six hundred sixty-five".