64526647680 has 864 divisors, whose sum is σ = 256325771520. Its totient is φ = 15519651840.

The previous prime is 64526647663. The next prime is 64526647697. The reversal of 64526647680 is 8674662546.

64526647680 is a `hidden beast` number, since 64 + 52 + 66 + 476 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (64526647663) and next prime (64526647697).

It is a tau number, because it is divible by the number of its divisors (864).

It is a super-3 number, since 3×64526647680³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 508083777 + ... + 508083903.

Almost surely, 2^64526647680 is an apocalyptic number.

64526647680 is a gapful number since it is divisible by the number (60) 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 64526647680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128162885760).

64526647680 is an abundant number, since it is smaller than the sum of its proper divisors (191799123840).

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

64526647680 is an equidigital number, since it uses as much as digits as its factorization.

64526647680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 54.

The spelling of 64526647680 in words is "sixty-four billion, five hundred twenty-six million, six hundred forty-seven thousand, six hundred eighty".