64071587845 has 4 divisors (see below), whose sum is σ = 76885905420. Its totient is φ = 51257270272.

The previous prime is 64071587843. The next prime is 64071587873. The reversal of 64071587845 is 54878517046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54878517046 = 2 ⋅27439258523.

It can be written as a sum of positive squares in 2 ways, for example, as 29701764964 + 34369822881 = 172342^2 + 185391^2 .

It is a cyclic number.

It is not a de Polignac number, because 64071587845 - 2¹ = 64071587843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64071587843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6407158780 + ... + 6407158789.

It is an arithmetic number, because the mean of its divisors is an integer number (19221476355).

Almost surely, 2^64071587845 is an apocalyptic number.

It is an amenable number.

64071587845 is a deficient number, since it is larger than the sum of its proper divisors (12814317575).

64071587845 is a wasteful number, since it uses less digits than its factorization.

64071587845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12814317574.

The product of its (nonzero) digits is 7526400, while the sum is 55.

The spelling of 64071587845 in words is "sixty-four billion, seventy-one million, five hundred eighty-seven thousand, eight hundred forty-five".