2661202265 has 4 divisors (see below), whose sum is σ = 3193442724. Its totient is φ = 2128961808.

The previous prime is 2661202249. The next prime is 2661202273. The reversal of 2661202265 is 5622021662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5622021662 = 2 ⋅2811010831.

It can be written as a sum of positive squares in 2 ways, for example, as 819333376 + 1841868889 = 28624^2 + 42917^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661202265 - 2⁴ = 2661202249 is a prime.

It is a super-2 number, since 2×2661202265² = 14163994990482260450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266120222 + ... + 266120231.

It is an arithmetic number, because the mean of its divisors is an integer number (798360681).

Almost surely, 2^2661202265 is an apocalyptic number.

It is an amenable number.

2661202265 is a deficient number, since it is larger than the sum of its proper divisors (532240459).

2661202265 is an equidigital number, since it uses as much as digits as its factorization.

2661202265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532240458.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 2661202265 is about 51586.8419754495. The cubic root of 2661202265 is about 1385.7746998520.

The spelling of 2661202265 in words is "two billion, six hundred sixty-one million, two hundred two thousand, two hundred sixty-five".