66256109568 has 608 divisors, whose sum is σ = 229511877120. Its totient is φ = 18685624320.

The previous prime is 66256109533. The next prime is 66256109581. The reversal of 66256109568 is 86590165266.

66256109568 is a `hidden beast` number, since 6 + 62 + 5 + 6 + 10 + 9 + 568 = 666.

It is a super-2 number, since 2×66256109568² (a number of 22 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1790705646 + ... + 1790705682.

It is an arithmetic number, because the mean of its divisors is an integer number (377486640).

Almost surely, 2^66256109568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66256109568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114755938560).

66256109568 is an abundant number, since it is smaller than the sum of its proper divisors (163255767552).

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

66256109568 is an equidigital number, since it uses as much as digits as its factorization.

66256109568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 66256109568 in words is "sixty-six billion, two hundred fifty-six million, one hundred nine thousand, five hundred sixty-eight".