66550442205 has 16 divisors (see below), whose sum is σ = 114671531520. Its totient is φ = 32763294528.

The previous prime is 66550442183. The next prime is 66550442243. The reversal of 66550442205 is 50224405566.

It is not a de Polignac number, because 66550442205 - 2⁸ = 66550441949 is a prime.

It is a super-2 number, since 2×66550442205² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170641965 + ... + 170642354.

It is an arithmetic number, because the mean of its divisors is an integer number (7166970720).

Almost surely, 2^66550442205 is an apocalyptic number.

66550442205 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66550442205 is a deficient number, since it is larger than the sum of its proper divisors (48121089315).

66550442205 is a wasteful number, since it uses less digits than its factorization.

66550442205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341284340.

The product of its (nonzero) digits is 288000, while the sum is 39.

The spelling of 66550442205 in words is "sixty-six billion, five hundred fifty million, four hundred forty-two thousand, two hundred five".