64816655385 has 32 divisors (see below), whose sum is σ = 109221840000. Its totient is φ = 32732384256.

The previous prime is 64816655339. The next prime is 64816655441. The reversal of 64816655385 is 58355661846.

It is not a de Polignac number, because 64816655385 - 2¹⁵ = 64816622617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 497121 + ... + 613809.

It is an arithmetic number, because the mean of its divisors is an integer number (3413182500).

Almost surely, 2^64816655385 is an apocalyptic number.

It is an amenable number.

64816655385 is a deficient number, since it is larger than the sum of its proper divisors (44405184615).

64816655385 is a wasteful number, since it uses less digits than its factorization.

64816655385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118665.

The product of its digits is 20736000, while the sum is 57.

The spelling of 64816655385 in words is "sixty-four billion, eight hundred sixteen million, six hundred fifty-five thousand, three hundred eighty-five".