65565126661 has 4 divisors (see below), whose sum is σ = 65577276000. Its totient is φ = 65552977324.

The previous prime is 65565126659. The next prime is 65565126667. The reversal of 65565126661 is 16662156556.

65565126661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65565126661 - 2¹ = 65565126659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65565126667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6066571 + ... + 6077368.

It is an arithmetic number, because the mean of its divisors is an integer number (16394319000).

Almost surely, 2^65565126661 is an apocalyptic number.

It is an amenable number.

65565126661 is a deficient number, since it is larger than the sum of its proper divisors (12149339).

65565126661 is a wasteful number, since it uses less digits than its factorization.

65565126661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12149338.

The product of its digits is 1944000, while the sum is 49.

The spelling of 65565126661 in words is "sixty-five billion, five hundred sixty-five million, one hundred twenty-six thousand, six hundred sixty-one".