11662872665 has 4 divisors (see below), whose sum is σ = 13995447204. Its totient is φ = 9330298128.

The previous prime is 11662872649. The next prime is 11662872673. The reversal of 11662872665 is 56627826611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56627826611 = 192611 ⋅294001.

It can be written as a sum of positive squares in 2 ways, for example, as 7806959449 + 3855913216 = 88357^2 + 62096^2 .

It is a cyclic number.

It is not a de Polignac number, because 11662872665 - 2⁴ = 11662872649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1166287262 + ... + 1166287271.

It is an arithmetic number, because the mean of its divisors is an integer number (3498861801).

Almost surely, 2^11662872665 is an apocalyptic number.

It is an amenable number.

11662872665 is a deficient number, since it is larger than the sum of its proper divisors (2332574539).

11662872665 is an equidigital number, since it uses as much as digits as its factorization.

11662872665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332574538.

The product of its digits is 1451520, while the sum is 50.

The spelling of 11662872665 in words is "eleven billion, six hundred sixty-two million, eight hundred seventy-two thousand, six hundred sixty-five".