64536816552 has 128 divisors (see below), whose sum is σ = 182743464960. Its totient is φ = 18854184960.

The previous prime is 64536816551. The next prime is 64536816563. The reversal of 64536816552 is 25561863546.

64536816552 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 64536816495 and 64536816504.

It is not an unprimeable number, because it can be changed into a prime (64536816551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 449668 + ... + 575564.

It is an arithmetic number, because the mean of its divisors is an integer number (1427683320).

Almost surely, 2^64536816552 is an apocalyptic number.

64536816552 is a gapful number since it is divisible by the number (62) 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 64536816552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91371732480).

64536816552 is an abundant number, since it is smaller than the sum of its proper divisors (118206648408).

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

64536816552 is a wasteful number, since it uses less digits than its factorization.

64536816552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126003 (or 125999 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 51.

The spelling of 64536816552 in words is "sixty-four billion, five hundred thirty-six million, eight hundred sixteen thousand, five hundred fifty-two".