65687054509 has 4 divisors (see below), whose sum is σ = 65687589760. Its totient is φ = 65686519260.

The previous prime is 65687054501. The next prime is 65687054519. The reversal of 65687054509 is 90545078656.

65687054509 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 65687054509 - 2³ = 65687054501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65687054509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65687054501) 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, 18244 + ... + 362914.

It is an arithmetic number, because the mean of its divisors is an integer number (16421897440).

Almost surely, 2^65687054509 is an apocalyptic number.

It is an amenable number.

65687054509 is a deficient number, since it is larger than the sum of its proper divisors (535251).

65687054509 is a wasteful number, since it uses less digits than its factorization.

65687054509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535250.

The product of its (nonzero) digits is 9072000, while the sum is 55.

The spelling of 65687054509 in words is "sixty-five billion, six hundred eighty-seven million, fifty-four thousand, five hundred nine".