66116570538 has 32 divisors (see below), whose sum is σ = 143682877440. Its totient is φ = 20205402480.

The previous prime is 66116570537. The next prime is 66116570551. The reversal of 66116570538 is 83507561166.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 9350820 + ... + 9357887.

It is an arithmetic number, because the mean of its divisors is an integer number (4490089920).

Almost surely, 2^66116570538 is an apocalyptic number.

66116570538 is an abundant number, since it is smaller than the sum of its proper divisors (77566306902).

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

66116570538 is a wasteful number, since it uses less digits than its factorization.

66116570538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18708762.

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 66116570538 in words is "sixty-six billion, one hundred sixteen million, five hundred seventy thousand, five hundred thirty-eight".