64537793605 has 8 divisors (see below), whose sum is σ = 77449340664. Its totient is φ = 51627576000.

The previous prime is 64537793599. The next prime is 64537793633. The reversal of 64537793605 is 50639773546.

It can be written as a sum of positive squares in 4 ways, for example, as 2507906241 + 62029887364 = 50079^2 + 249058^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64537793605 - 2¹⁹ = 64537269317 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 7 ways as a sum of consecutive naturals, for example, 222246 + ... + 422455.

It is an arithmetic number, because the mean of its divisors is an integer number (9681167583).

Almost surely, 2^64537793605 is an apocalyptic number.

It is an amenable number.

64537793605 is a deficient number, since it is larger than the sum of its proper divisors (12911547059).

64537793605 is a wasteful number, since it uses less digits than its factorization.

64537793605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664727.

The product of its (nonzero) digits is 14288400, while the sum is 55.

The spelling of 64537793605 in words is "sixty-four billion, five hundred thirty-seven million, seven hundred ninety-three thousand, six hundred five".