66550000000 has 288 divisors, whose sum is σ = 182285062920. Its totient is φ = 24200000000.

The previous prime is 66549999973. The next prime is 66550000043. The reversal of 66550000000 is 5566.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

66550000000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6049999995 + ... + 6050000005.

Almost surely, 2^66550000000 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 66550000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91142531460).

66550000000 is an abundant number, since it is smaller than the sum of its proper divisors (115735062920).

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

66550000000 is an frugal number, since it uses more digits than its factorization.

66550000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

Multiplying 66550000000 by its sum of digits (22), we get a 4-th power (1464100000000 = 1100⁴).

66550000000 divided by its sum of digits (22) gives a square (3025000000 = 55000²).

Adding to 66550000000 its reverse (5566), we get a palindrome (66550005566).

The spelling of 66550000000 in words is "sixty-six billion, five hundred fifty million", and thus it is an aban number.