65820268685 has 4 divisors (see below), whose sum is σ = 78984322428. Its totient is φ = 52656214944.

The previous prime is 65820268667. The next prime is 65820268727. The reversal of 65820268685 is 58686202856.

65820268685 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 25166015044 + 40654253641 = 158638^2 + 201629^2 .

It is a cyclic number.

It is not a de Polignac number, because 65820268685 - 2⁶ = 65820268621 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 65820268685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6582026864 + ... + 6582026873.

It is an arithmetic number, because the mean of its divisors is an integer number (19746080607).

Almost surely, 2^65820268685 is an apocalyptic number.

It is an amenable number.

65820268685 is a deficient number, since it is larger than the sum of its proper divisors (13164053743).

65820268685 is a wasteful number, since it uses less digits than its factorization.

65820268685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13164053742.

The product of its (nonzero) digits is 11059200, while the sum is 56.

The spelling of 65820268685 in words is "sixty-five billion, eight hundred twenty million, two hundred sixty-eight thousand, six hundred eighty-five".