65820777485 has 4 divisors (see below), whose sum is σ = 78984932988. Its totient is φ = 52656621984.

The previous prime is 65820777427. The next prime is 65820777511. The reversal of 65820777485 is 58477702856.

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 49806634276 + 16014143209 = 223174^2 + 126547^2 .

It is a cyclic number.

It is not a de Polignac number, because 65820777485 - 2¹⁴ = 65820761101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6582077744 + ... + 6582077753.

It is an arithmetic number, because the mean of its divisors is an integer number (19746233247).

Almost surely, 2^65820777485 is an apocalyptic number.

It is an amenable number.

65820777485 is a deficient number, since it is larger than the sum of its proper divisors (13164155503).

65820777485 is a wasteful number, since it uses less digits than its factorization.

65820777485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13164155502.

The product of its (nonzero) digits is 26342400, while the sum is 59.

The spelling of 65820777485 in words is "sixty-five billion, eight hundred twenty million, seven hundred seventy-seven thousand, four hundred eighty-five".