66258633856 has 64 divisors (see below), whose sum is σ = 136073763000. Its totient is φ = 32113483776.

The previous prime is 66258633853. The next prime is 66258633907. The reversal of 66258633856 is 65833685266.

It can be written as a sum of positive squares in 4 ways, for example, as 66040776256 + 217857600 = 256984^2 + 14760^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 66258633856.

It is not an unprimeable number, because it can be changed into a prime (66258633851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1247980 + ... + 1299988.

Almost surely, 2^66258633856 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 66258633856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68036881500).

66258633856 is an abundant number, since it is smaller than the sum of its proper divisors (69815129144).

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

66258633856 is a wasteful number, since it uses less digits than its factorization.

66258633856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52329 (or 52317 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 58.

The spelling of 66258633856 in words is "sixty-six billion, two hundred fifty-eight million, six hundred thirty-three thousand, eight hundred fifty-six".