66116570539 has 4 divisors (see below), whose sum is σ = 67364053056. Its totient is φ = 64869088024.

The previous prime is 66116570537. The next prime is 66116570551. The reversal of 66116570539 is 93507561166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66116570539 - 2¹ = 66116570537 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66116570492 and 66116570501.

It is not an unprimeable number, because it can be changed into a prime (66116570537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623741179 + ... + 623741284.

It is an arithmetic number, because the mean of its divisors is an integer number (16841013264).

Almost surely, 2^66116570539 is an apocalyptic number.

66116570539 is a deficient number, since it is larger than the sum of its proper divisors (1247482517).

66116570539 is a wasteful number, since it uses less digits than its factorization.

66116570539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247482516.

The product of its (nonzero) digits is 1020600, while the sum is 49.

The spelling of 66116570539 in words is "sixty-six billion, one hundred sixteen million, five hundred seventy thousand, five hundred thirty-nine".