2665543653 has 8 divisors (see below), whose sum is σ = 3948953600. Its totient is φ = 1777029084.

The previous prime is 2665543637. The next prime is 2665543663. The reversal of 2665543653 is 3563455662.

2665543653 is a `hidden beast` number, since 2 + 66 + 554 + 36 + 5 + 3 = 666.

It is not a de Polignac number, because 2665543653 - 2⁴ = 2665543637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2665543599 and 2665543608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665543663) 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, 49361893 + ... + 49361946.

It is an arithmetic number, because the mean of its divisors is an integer number (493619200).

Almost surely, 2^2665543653 is an apocalyptic number.

It is an amenable number.

2665543653 is a deficient number, since it is larger than the sum of its proper divisors (1283409947).

2665543653 is an equidigital number, since it uses as much as digits as its factorization.

2665543653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98723848 (or 98723842 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 45.

The square root of 2665543653 is about 51628.9032713266. The cubic root of 2665543653 is about 1386.5278578219.

The spelling of 2665543653 in words is "two billion, six hundred sixty-five million, five hundred forty-three thousand, six hundred fifty-three".