1116646565 has 4 divisors (see below), whose sum is σ = 1339975884. Its totient is φ = 893317248.

The previous prime is 1116646561. The next prime is 1116646579. The reversal of 1116646565 is 5656466111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5656466111 = 89 ⋅63555799.

It can be written as a sum of positive squares in 2 ways, for example, as 635897089 + 480749476 = 25217^2 + 21926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1116646565 - 2² = 1116646561 is a prime.

It is a super-2 number, since 2×1116646565² = 2493799102252598450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1116646561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111664652 + ... + 111664661.

It is an arithmetic number, because the mean of its divisors is an integer number (334993971).

Almost surely, 2^1116646565 is an apocalyptic number.

It is an amenable number.

1116646565 is a deficient number, since it is larger than the sum of its proper divisors (223329319).

1116646565 is an equidigital number, since it uses as much as digits as its factorization.

1116646565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223329318.

The product of its digits is 129600, while the sum is 41.

The square root of 1116646565 is about 33416.2619842495. The cubic root of 1116646565 is about 1037.4613144718.

The spelling of 1116646565 in words is "one billion, one hundred sixteen million, six hundred forty-six thousand, five hundred sixty-five".