11220665 has 8 divisors (see below), whose sum is σ = 14050368. Its totient is φ = 8586160.

The previous prime is 11220653. The next prime is 11220673. The reversal of 11220665 is 56602211.

11220665 = T₃₈₃ + T₃₈₄ + ... + T₄₉₇.

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-11220665 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 11220665.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48671 + ... + 48900.

It is an arithmetic number, because the mean of its divisors is an integer number (1756296).

Almost surely, 2^11220665 is an apocalyptic number.

It is an amenable number.

11220665 is a deficient number, since it is larger than the sum of its proper divisors (2829703).

11220665 is an equidigital number, since it uses as much as digits as its factorization.

11220665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97599.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 11220665 is about 3349.7261082065. The cubic root of 11220665 is about 223.8753092702.

Adding to 11220665 its reverse (56602211), we get a palindrome (67822876).

The spelling of 11220665 in words is "eleven million, two hundred twenty thousand, six hundred sixty-five".