64642443999999 has 8 divisors (see below), whose sum is σ = 86190115302912. Its totient is φ = 43094867681880.

The previous prime is 64642443999949. The next prime is 64642444000159. The reversal of 64642443999999 is 99999934424646.

It is a happy number.

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

It is not a de Polignac number, because 64642443999999 - 2²⁵ = 64642410445567 is a prime.

It is a super-2 number, since 2×64642443999999² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64642443999949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22142767 + ... + 24891504.

It is an arithmetic number, because the mean of its divisors is an integer number (10773764412864).

Almost surely, 2^{64642443999999} is an apocalyptic number.

64642443999999 is a deficient number, since it is larger than the sum of its proper divisors (21547671302913).

64642443999999 is a wasteful number, since it uses less digits than its factorization.

64642443999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47492397.

The product of its digits is 29386561536, while the sum is 87.

The spelling of 64642443999999 in words is "sixty-four trillion, six hundred forty-two billion, four hundred forty-three million, nine hundred ninety-nine thousand, nine hundred ninety-nine".