2618266561 has 3 divisors (see below), whose sum is σ = 2618317731. Its totient is φ = 2618215392.

The previous prime is 2618266559. The next prime is 2618266579. The reversal of 2618266561 is 1656628162.

The square root of 2618266561 is 51169.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 185804161 + 2432462400 = 13631^2 + 49320^2 .

It is not a de Polignac number, because 2618266561 - 2¹ = 2618266559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2618266061) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 25585 + ... + 76753.

It is an arithmetic number, because the mean of its divisors is an integer number (872772577).

Almost surely, 2^2618266561 is an apocalyptic number.

2618266561 is the 51169-th square number.

2618266561 is the 25585-th centered octagonal number.

It is an amenable number.

2618266561 is a deficient number, since it is larger than the sum of its proper divisors (51170).

2618266561 is an frugal number, since it uses more digits than its factorization.

2618266561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102338 (or 51169 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The cubic root of 2618266561 is about 1378.2815831468.

The spelling of 2618266561 in words is "two billion, six hundred eighteen million, two hundred sixty-six thousand, five hundred sixty-one".