64443699456 has 72 divisors (see below), whose sum is σ = 171751629504. Its totient is φ = 21451499520.

The previous prime is 64443699451. The next prime is 64443699461. The reversal of 64443699456 is 65499634446.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64443699451) and next prime (64443699461).

It is a self number, because there is not a number n which added to its sum of digits gives 64443699456.

It is not an unprimeable number, because it can be changed into a prime (64443699451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500626 + ... + 616046.

Almost surely, 2^64443699456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64443699456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85875814752).

64443699456 is an abundant number, since it is smaller than the sum of its proper divisors (107307930048).

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

64443699456 is a wasteful number, since it uses less digits than its factorization.

64443699456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116167 (or 116153 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 60.

The spelling of 64443699456 in words is "sixty-four billion, four hundred forty-three million, six hundred ninety-nine thousand, four hundred fifty-six".