64944534009 has 8 divisors (see below), whose sum is σ = 86603860480. Its totient is φ = 43290781776.

The previous prime is 64944534007. The next prime is 64944534041. The reversal of 64944534009 is 90043544946.

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

It is not a de Polignac number, because 64944534009 - 2¹ = 64944534007 is a prime.

It is a super-2 number, since 2×64944534009² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64944534007) 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, 1366297 + ... + 1413030.

It is an arithmetic number, because the mean of its divisors is an integer number (10825482560).

Almost surely, 2^64944534009 is an apocalyptic number.

It is an amenable number.

64944534009 is a deficient number, since it is larger than the sum of its proper divisors (21659326471).

64944534009 is a wasteful number, since it uses less digits than its factorization.

64944534009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787119.

The product of its (nonzero) digits is 1866240, while the sum is 48.

The spelling of 64944534009 in words is "sixty-four billion, nine hundred forty-four million, five hundred thirty-four thousand, nine".