66506550136 has 256 divisors, whose sum is σ = 156039004800. Its totient is φ = 26228883456.

The previous prime is 66506550053. The next prime is 66506550137. The reversal of 66506550136 is 63105560566.

It is a junction number, because it is equal to n+sod(n) for n = 66506550092 and 66506550101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66506550137) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 90731626 + ... + 90732358.

Almost surely, 2^66506550136 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 66506550136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78019502400).

66506550136 is an abundant number, since it is smaller than the sum of its proper divisors (89532454664).

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

66506550136 is a wasteful number, since it uses less digits than its factorization.

66506550136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 43.

The spelling of 66506550136 in words is "sixty-six billion, five hundred six million, five hundred fifty thousand, one hundred thirty-six".