66650055 has 16 divisors (see below), whose sum is σ = 106744704. Its totient is φ = 35511840.

The previous prime is 66650029. The next prime is 66650057. The reversal of 66650055 is 55005666.

It is not a de Polignac number, because 66650055 - 2¹⁶ = 66584519 is a prime.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66649998 and 66650025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66650057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23040 + ... + 25770.

It is an arithmetic number, because the mean of its divisors is an integer number (6671544).

Almost surely, 2^66650055 is an apocalyptic number.

66650055 is a deficient number, since it is larger than the sum of its proper divisors (40094649).

66650055 is a wasteful number, since it uses less digits than its factorization.

66650055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4366.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 66650055 is about 8163.9484932231. The cubic root of 66650055 is about 405.4464517365.

It can be divided in two parts, 666 and 50055, that added together give a triangular number (50721 = T₃₁₈).

The spelling of 66650055 in words is "sixty-six million, six hundred fifty thousand, fifty-five".