64056912805 has 4 divisors (see below), whose sum is σ = 76868295372. Its totient is φ = 51245530240.

The previous prime is 64056912767. The next prime is 64056912811. The reversal of 64056912805 is 50821965046.

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 50017980609 + 14038932196 = 223647^2 + 118486^2 .

It is not a de Polignac number, because 64056912805 - 2⁷ = 64056912677 is a prime.

It is a Duffinian number.

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, 6405691276 + ... + 6405691285.

It is an arithmetic number, because the mean of its divisors is an integer number (19217073843).

Almost surely, 2^64056912805 is an apocalyptic number.

It is an amenable number.

64056912805 is a deficient number, since it is larger than the sum of its proper divisors (12811382567).

64056912805 is a wasteful number, since it uses less digits than its factorization.

64056912805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12811382566.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 64056912805 in words is "sixty-four billion, fifty-six million, nine hundred twelve thousand, eight hundred five".