66720528895 has 8 divisors (see below), whose sum is σ = 80640640080. Its totient is φ = 52992419520.

The previous prime is 66720528871. The next prime is 66720528911. The reversal of 66720528895 is 59882502766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66720528895 - 2³¹ = 64573045247 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47999686 + ... + 48001075.

It is an arithmetic number, because the mean of its divisors is an integer number (10080080010).

Almost surely, 2^66720528895 is an apocalyptic number.

66720528895 is a deficient number, since it is larger than the sum of its proper divisors (13920111185).

66720528895 is a wasteful number, since it uses less digits than its factorization.

66720528895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96000905.

The product of its (nonzero) digits is 14515200, while the sum is 58.

The spelling of 66720528895 in words is "sixty-six billion, seven hundred twenty million, five hundred twenty-eight thousand, eight hundred ninety-five".