64943098085 has 4 divisors (see below), whose sum is σ = 77931717708. Its totient is φ = 51954478464.

The previous prime is 64943098049. The next prime is 64943098091. The reversal of 64943098085 is 58089034946.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58089034946 = 2 ⋅29044517473.

It can be written as a sum of positive squares in 2 ways, for example, as 22262430436 + 42680667649 = 149206^2 + 206593^2 .

It is a cyclic number.

It is not a de Polignac number, because 64943098085 - 2³⁴ = 47763228901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64943098085.

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, 6494309804 + ... + 6494309813.

It is an arithmetic number, because the mean of its divisors is an integer number (19482929427).

Almost surely, 2^64943098085 is an apocalyptic number.

It is an amenable number.

64943098085 is a deficient number, since it is larger than the sum of its proper divisors (12988619623).

64943098085 is a wasteful number, since it uses less digits than its factorization.

64943098085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12988619622.

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 64943098085 in words is "sixty-four billion, nine hundred forty-three million, ninety-eight thousand, eighty-five".