64310550985 has 4 divisors (see below), whose sum is σ = 77172661188. Its totient is φ = 51448440784.

The previous prime is 64310550977. The next prime is 64310550989. The reversal of 64310550985 is 58905501346.

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 38983738249 + 25326812736 = 197443^2 + 159144^2 .

It is a cyclic number.

It is not a de Polignac number, because 64310550985 - 2³ = 64310550977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64310550989) by changing a digit.

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, 6431055094 + ... + 6431055103.

It is an arithmetic number, because the mean of its divisors is an integer number (19293165297).

Almost surely, 2^64310550985 is an apocalyptic number.

It is an amenable number.

64310550985 is a deficient number, since it is larger than the sum of its proper divisors (12862110203).

64310550985 is a wasteful number, since it uses less digits than its factorization.

64310550985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12862110202.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 64310550985 in words is "sixty-four billion, three hundred ten million, five hundred fifty thousand, nine hundred eighty-five".