65406282985 has 4 divisors (see below), whose sum is σ = 78487539588. Its totient is φ = 52325026384.

The previous prime is 65406282971. The next prime is 65406283049. The reversal of 65406282985 is 58928260456.

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 27911382489 + 37494900496 = 167067^2 + 193636^2 .

It is a cyclic number.

It is not a de Polignac number, because 65406282985 - 2³¹ = 63258799337 is a prime.

It is a Duffinian 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, 6540628294 + ... + 6540628303.

It is an arithmetic number, because the mean of its divisors is an integer number (19621884897).

Almost surely, 2^65406282985 is an apocalyptic number.

It is an amenable number.

65406282985 is a deficient number, since it is larger than the sum of its proper divisors (13081256603).

65406282985 is a wasteful number, since it uses less digits than its factorization.

65406282985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13081256602.

The product of its (nonzero) digits is 8294400, while the sum is 55.

The spelling of 65406282985 in words is "sixty-five billion, four hundred six million, two hundred eighty-two thousand, nine hundred eighty-five".