66936521360 has 20 divisors (see below), whose sum is σ = 155627412348. Its totient is φ = 26774608512.

The previous prime is 66936521359. The next prime is 66936521369. The reversal of 66936521360 is 6312563966.

It can be written as a sum of positive squares in 2 ways, for example, as 48099507856 + 18837013504 = 219316^2 + 137248^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (66936521369) 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 3 ways as a sum of consecutive naturals, for example, 418353179 + ... + 418353338.

Almost surely, 2^66936521360 is an apocalyptic number.

It is an amenable number.

66936521360 is an abundant number, since it is smaller than the sum of its proper divisors (88690890988).

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

66936521360 is a wasteful number, since it uses less digits than its factorization.

66936521360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836706530 (or 836706524 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 47.

The spelling of 66936521360 in words is "sixty-six billion, nine hundred thirty-six million, five hundred twenty-one thousand, three hundred sixty".