64991446447 has 8 divisors (see below), whose sum is σ = 65320572240. Its totient is φ = 64662715200.

The previous prime is 64991446439. The next prime is 64991446453. The reversal of 64991446447 is 74464419946.

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 64991446447 - 2³ = 64991446439 is a prime.

It is a super-2 number, since 2×64991446447² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64991446391 and 64991446400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64991446547) 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, 234483 + ... + 430075.

It is an arithmetic number, because the mean of its divisors is an integer number (8165071530).

Almost surely, 2^64991446447 is an apocalyptic number.

64991446447 is a deficient number, since it is larger than the sum of its proper divisors (329125793).

64991446447 is a wasteful number, since it uses less digits than its factorization.

64991446447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197273.

The product of its digits is 20901888, while the sum is 58.

The spelling of 64991446447 in words is "sixty-four billion, nine hundred ninety-one million, four hundred forty-six thousand, four hundred forty-seven".