2661326063653 has 8 divisors (see below), whose sum is σ = 2674184244248. Its totient is φ = 2648495625984.

The previous prime is 2661326063551. The next prime is 2661326063659. The reversal of 2661326063653 is 3563606231662.

It can be written as a sum of positive squares in 4 ways, for example, as 91338741729 + 2569987321924 = 302223^2 + 1603118^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2661326063653 - 2²⁵ = 2661292509221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2661326063597 and 2661326063606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661326063659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6743400 + ... + 7127137.

It is an arithmetic number, because the mean of its divisors is an integer number (334273030531).

Almost surely, 2^{2661326063653} is an apocalyptic number.

It is an amenable number.

2661326063653 is a deficient number, since it is larger than the sum of its proper divisors (12858180595).

2661326063653 is a wasteful number, since it uses less digits than its factorization.

2661326063653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13871463.

The product of its (nonzero) digits is 4199040, while the sum is 49.

The spelling of 2661326063653 in words is "two trillion, six hundred sixty-one billion, three hundred twenty-six million, sixty-three thousand, six hundred fifty-three".