64509462085 has 4 divisors (see below), whose sum is σ = 77411354508. Its totient is φ = 51607569664.

The previous prime is 64509462079. The next prime is 64509462089. The reversal of 64509462085 is 58026490546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58026490546 = 2 ⋅29013245273.

It can be written as a sum of positive squares in 2 ways, for example, as 24460647201 + 40048814884 = 156399^2 + 200122^2 .

It is a cyclic number.

It is not a de Polignac number, because 64509462085 - 2⁹ = 64509461573 is a prime.

It is a super-2 number, since 2×64509462085² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64509462089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6450946204 + ... + 6450946213.

It is an arithmetic number, because the mean of its divisors is an integer number (19352838627).

Almost surely, 2^64509462085 is an apocalyptic number.

It is an amenable number.

64509462085 is a deficient number, since it is larger than the sum of its proper divisors (12901892423).

64509462085 is a wasteful number, since it uses less digits than its factorization.

64509462085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12901892422.

The product of its (nonzero) digits is 2073600, while the sum is 49.

The spelling of 64509462085 in words is "sixty-four billion, five hundred nine million, four hundred sixty-two thousand, eighty-five".