64421843376 has 160 divisors (see below), whose sum is σ = 189932843520. Its totient is φ = 18625024000.

The previous prime is 64421843351. The next prime is 64421843389. The reversal of 64421843376 is 67334812446.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4863130 + ... + 4876358.

It is an arithmetic number, because the mean of its divisors is an integer number (1187080272).

Almost surely, 2^64421843376 is an apocalyptic number.

64421843376 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64421843376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94966421760).

64421843376 is an abundant number, since it is smaller than the sum of its proper divisors (125511000144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64421843376 is a wasteful number, since it uses less digits than its factorization.

64421843376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13675 (or 13669 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 48.

The spelling of 64421843376 in words is "sixty-four billion, four hundred twenty-one million, eight hundred forty-three thousand, three hundred seventy-six".