66605060560 has 40 divisors (see below), whose sum is σ = 155712361896. Its totient is φ = 26494824960.

The previous prime is 66605060551. The next prime is 66605060567. The reversal of 66605060560 is 6506050666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1097729424 + 65507331136 = 33132^2 + 255944^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66605060567) 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 7 ways as a sum of consecutive naturals, for example, 2285419 + ... + 2314378.

Almost surely, 2^66605060560 is an apocalyptic number.

It is an amenable number.

66605060560 is an abundant number, since it is smaller than the sum of its proper divisors (89107301336).

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

66605060560 is a wasteful number, since it uses less digits than its factorization.

66605060560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4599991 (or 4599985 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 66605060560 in words is "sixty-six billion, six hundred five million, sixty thousand, five hundred sixty".