64630471585 has 4 divisors (see below), whose sum is σ = 77556565908. Its totient is φ = 51704377264.

The previous prime is 64630471553. The next prime is 64630471597. The reversal of 64630471585 is 58517403646.

64630471585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 39870504976 + 24759966609 = 199676^2 + 157353^2 .

It is a cyclic number.

It is not a de Polignac number, because 64630471585 - 2⁵ = 64630471553 is a prime.

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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6463047154 + ... + 6463047163.

It is an arithmetic number, because the mean of its divisors is an integer number (19389141477).

Almost surely, 2^64630471585 is an apocalyptic number.

It is an amenable number.

64630471585 is a deficient number, since it is larger than the sum of its proper divisors (12926094323).

64630471585 is a wasteful number, since it uses less digits than its factorization.

64630471585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12926094322.

The product of its (nonzero) digits is 2419200, while the sum is 49.

The spelling of 64630471585 in words is "sixty-four billion, six hundred thirty million, four hundred seventy-one thousand, five hundred eighty-five".