3661122665 has 4 divisors (see below), whose sum is σ = 4393347204. Its totient is φ = 2928898128.

The previous prime is 3661122659. The next prime is 3661122679. The reversal of 3661122665 is 5662211663.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5662211663 = 43 ⋅131679341.

It can be written as a sum of positive squares in 2 ways, for example, as 1915637824 + 1745484841 = 43768^2 + 41779^2 .

It is a cyclic number.

It is not a de Polignac number, because 3661122665 - 2¹⁰ = 3661121641 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, 366112262 + ... + 366112271.

It is an arithmetic number, because the mean of its divisors is an integer number (1098336801).

Almost surely, 2^3661122665 is an apocalyptic number.

It is an amenable number.

3661122665 is a deficient number, since it is larger than the sum of its proper divisors (732224539).

3661122665 is an equidigital number, since it uses as much as digits as its factorization.

3661122665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732224538.

The product of its digits is 77760, while the sum is 38.

The square root of 3661122665 is about 60507.2116776174. The cubic root of 3661122665 is about 1541.2440985446.

The spelling of 3661122665 in words is "three billion, six hundred sixty-one million, one hundred twenty-two thousand, six hundred sixty-five".