64856635738 has 8 divisors (see below), whose sum is σ = 97360313760. Its totient is φ = 32403197820.

The previous prime is 64856635699. The next prime is 64856635799. The reversal of 64856635738 is 83753665846.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12556798 + ... + 12561961.

It is an arithmetic number, because the mean of its divisors is an integer number (12170039220).

Almost surely, 2^64856635738 is an apocalyptic number.

64856635738 is a deficient number, since it is larger than the sum of its proper divisors (32503678022).

64856635738 is a wasteful number, since it uses less digits than its factorization.

64856635738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25120052.

The product of its digits is 87091200, while the sum is 61.

The spelling of 64856635738 in words is "sixty-four billion, eight hundred fifty-six million, six hundred thirty-five thousand, seven hundred thirty-eight".