66293881285 has 8 divisors (see below), whose sum is σ = 79611117336. Its totient is φ = 52996131840.

The previous prime is 66293881261. The next prime is 66293881289. The reversal of 66293881285 is 58218839266.

It can be written as a sum of positive squares in 4 ways, for example, as 16518932676 + 49774948609 = 128526^2 + 223103^2 .

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

It is not a de Polignac number, because 66293881285 - 2³³ = 57703946693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66293881289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4864164 + ... + 4877773.

It is an arithmetic number, because the mean of its divisors is an integer number (9951389667).

Almost surely, 2^66293881285 is an apocalyptic number.

It is an amenable number.

66293881285 is a deficient number, since it is larger than the sum of its proper divisors (13317236051).

66293881285 is a wasteful number, since it uses less digits than its factorization.

66293881285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9743303.

The product of its digits is 9953280, while the sum is 58.

The spelling of 66293881285 in words is "sixty-six billion, two hundred ninety-three million, eight hundred eighty-one thousand, two hundred eighty-five".