64529581368 has 48 divisors (see below), whose sum is σ = 187662561480. Its totient is φ = 18437022912.

The previous prime is 64529581351. The next prime is 64529581373. The reversal of 64529581368 is 86318592546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27434871 + ... + 27437222.

Almost surely, 2^64529581368 is an apocalyptic number.

It is an amenable number.

64529581368 is an abundant number, since it is smaller than the sum of its proper divisors (123132980112).

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

64529581368 is a wasteful number, since it uses less digits than its factorization.

64529581368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54872116 (or 54872105 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 57.

The spelling of 64529581368 in words is "sixty-four billion, five hundred twenty-nine million, five hundred eighty-one thousand, three hundred sixty-eight".