64438863851 has 8 divisors (see below), whose sum is σ = 68386966704. Its totient is φ = 60508270080.

The previous prime is 64438863787. The next prime is 64438863901. The reversal of 64438863851 is 15836883446.

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

It is a cyclic number.

It is not a de Polignac number, because 64438863851 - 2⁶ = 64438863787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64438860851) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4369685 + ... + 4384406.

It is an arithmetic number, because the mean of its divisors is an integer number (8548370838).

Almost surely, 2^64438863851 is an apocalyptic number.

64438863851 is a deficient number, since it is larger than the sum of its proper divisors (3948102853).

64438863851 is a wasteful number, since it uses less digits than its factorization.

64438863851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8754541.

The product of its digits is 13271040, while the sum is 56.

The spelling of 64438863851 in words is "sixty-four billion, four hundred thirty-eight million, eight hundred sixty-three thousand, eight hundred fifty-one".