66255538893 has 4 divisors (see below), whose sum is σ = 88340718528. Its totient is φ = 44170359260.

The previous prime is 66255538891. The next prime is 66255538903. The reversal of 66255538893 is 39883555266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66255538893 - 2¹ = 66255538891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66255538891) 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, 11042589813 + ... + 11042589818.

It is an arithmetic number, because the mean of its divisors is an integer number (22085179632).

Almost surely, 2^66255538893 is an apocalyptic number.

It is an amenable number.

66255538893 is a deficient number, since it is larger than the sum of its proper divisors (22085179635).

66255538893 is a wasteful number, since it uses less digits than its factorization.

66255538893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22085179634.

The product of its digits is 46656000, while the sum is 60.

The spelling of 66255538893 in words is "sixty-six billion, two hundred fifty-five million, five hundred thirty-eight thousand, eight hundred ninety-three".