1101564665 has 4 divisors (see below), whose sum is σ = 1321877604. Its totient is φ = 881251728.

The previous prime is 1101564649. The next prime is 1101564697. The reversal of 1101564665 is 5664651011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5664651011 = 263 ⋅21538597.

It can be written as a sum of positive squares in 2 ways, for example, as 858079849 + 243484816 = 29293^2 + 15604^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101564665 - 2⁴ = 1101564649 is a prime.

It is a super-2 number, since 2×1101564665² = 2426889422353124450, which contains 22 as substring.

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, 110156462 + ... + 110156471.

It is an arithmetic number, because the mean of its divisors is an integer number (330469401).

Almost surely, 2^1101564665 is an apocalyptic number.

It is an amenable number.

1101564665 is a deficient number, since it is larger than the sum of its proper divisors (220312939).

1101564665 is an equidigital number, since it uses as much as digits as its factorization.

1101564665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220312938.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 1101564665 is about 33189.8277338102. The cubic root of 1101564665 is about 1032.7693298055.

The spelling of 1101564665 in words is "one billion, one hundred one million, five hundred sixty-four thousand, six hundred sixty-five".