64538336768 has 20 divisors (see below), whose sum is σ = 128950623120. Its totient is φ = 32269168128.

The previous prime is 64538336713. The next prime is 64538336783. The reversal of 64538336768 is 86763383546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63025208 + ... + 63026231.

It is an arithmetic number, because the mean of its divisors is an integer number (6447531156).

Almost surely, 2^64538336768 is an apocalyptic number.

It is an amenable number.

64538336768 is a deficient number, since it is larger than the sum of its proper divisors (64412286352).

64538336768 is an equidigital number, since it uses as much as digits as its factorization.

64538336768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126051457 (or 126051441 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 59.

The spelling of 64538336768 in words is "sixty-four billion, five hundred thirty-eight million, three hundred thirty-six thousand, seven hundred sixty-eight".