64507532544 has 1080 divisors, whose sum is σ = 251452716480. Its totient is φ = 16273281024.

The previous prime is 64507532539. The next prime is 64507532569. The reversal of 64507532544 is 44523570546.

64507532544 is a `hidden beast` number, since 6 + 4 + 5 + 0 + 75 + 32 + 544 = 666.

It is a super-3 number, since 3×64507532544³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 64507532544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2804675317 + ... + 2804675339.

Almost surely, 2^64507532544 is an apocalyptic number.

64507532544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64507532544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125726358240).

64507532544 is an abundant number, since it is smaller than the sum of its proper divisors (186945183936).

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

64507532544 is an equidigital number, since it uses as much as digits as its factorization.

64507532544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 45.

The spelling of 64507532544 in words is "sixty-four billion, five hundred seven million, five hundred thirty-two thousand, five hundred forty-four".