66656006550 has 144 divisors (see below), whose sum is σ = 205090659072. Its totient is φ = 15204024000.

The previous prime is 66656006509. The next prime is 66656006551. The reversal of 66656006550 is 5560065666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 66656006496 and 66656006505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66656006551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1512325 + ... + 1555775.

It is an arithmetic number, because the mean of its divisors is an integer number (1424240688).

Almost surely, 2^66656006550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66656006550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102545329536).

66656006550 is an abundant number, since it is smaller than the sum of its proper divisors (138434652522).

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

66656006550 is a wasteful number, since it uses less digits than its factorization.

66656006550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43963 (or 43955 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 45.

The spelling of 66656006550 in words is "sixty-six billion, six hundred fifty-six million, six thousand, five hundred fifty".