66511532320 has 24 divisors (see below), whose sum is σ = 157133495484. Its totient is φ = 26604612864.

The previous prime is 66511532299. The next prime is 66511532359. The reversal of 66511532320 is 2323511566.

66511532320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 58318386064 + 8193146256 = 241492^2 + 90516^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207848379 + ... + 207848698.

Almost surely, 2^66511532320 is an apocalyptic number.

It is an amenable number.

66511532320 is an abundant number, since it is smaller than the sum of its proper divisors (90621963164).

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

66511532320 is a wasteful number, since it uses less digits than its factorization.

66511532320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415697092 (or 415697084 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 66511532320 in words is "sixty-six billion, five hundred eleven million, five hundred thirty-two thousand, three hundred twenty".