65565556501 has 4 divisors (see below), whose sum is σ = 65580391404. Its totient is φ = 65550721600.

The previous prime is 65565556499. The next prime is 65565556549. The reversal of 65565556501 is 10565556556.

65565556501 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.

It can be written as a sum of positive squares in 2 ways, for example, as 32958587025 + 32606969476 = 181545^2 + 180574^2 .

It is a cyclic number.

It is not a de Polignac number, because 65565556501 - 2¹ = 65565556499 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 (65565556201) 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, 7410820 + ... + 7419661.

It is an arithmetic number, because the mean of its divisors is an integer number (16395097851).

Almost surely, 2^65565556501 is an apocalyptic number.

It is an amenable number.

65565556501 is a deficient number, since it is larger than the sum of its proper divisors (14834903).

65565556501 is a wasteful number, since it uses less digits than its factorization.

65565556501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14834902.

The product of its (nonzero) digits is 3375000, while the sum is 49.

Subtracting from 65565556501 its reverse (10565556556), we obtain a palindrome (54999999945).

The spelling of 65565556501 in words is "sixty-five billion, five hundred sixty-five million, five hundred fifty-six thousand, five hundred one".