64438621443 has 60 divisors (see below), whose sum is σ = 111480584280. Its totient is φ = 36785136528.

The previous prime is 64438621411. The next prime is 64438621451. The reversal of 64438621443 is 34412683446.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

64438621443 is a `hidden beast` number, since 6 + 443 + 8 + 62 + 144 + 3 = 666.

It is not a de Polignac number, because 64438621443 - 2⁵ = 64438621411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64438621493) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 64632021 + ... + 64633017.

It is an arithmetic number, because the mean of its divisors is an integer number (1858009738).

Almost surely, 2^64438621443 is an apocalyptic number.

64438621443 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

64438621443 is a deficient number, since it is larger than the sum of its proper divisors (47041962837).

64438621443 is an frugal number, since it uses more digits than its factorization.

64438621443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031 (or 1007 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 45.

The spelling of 64438621443 in words is "sixty-four billion, four hundred thirty-eight million, six hundred twenty-one thousand, four hundred forty-three".