66155011111 has 8 divisors (see below), whose sum is σ = 75666857120. Its totient is φ = 56658447648.

The previous prime is 66155011093. The next prime is 66155011147. The reversal of 66155011111 is 11111055166.

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

It is a cyclic number.

It is not a de Polignac number, because 66155011111 - 2⁵ = 66155011079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66155011111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66155011171) 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, 3811356 + ... + 3828673.

It is an arithmetic number, because the mean of its divisors is an integer number (9458357140).

Almost surely, 2^66155011111 is an apocalyptic number.

66155011111 is a deficient number, since it is larger than the sum of its proper divisors (9511846009).

66155011111 is a wasteful number, since it uses less digits than its factorization.

66155011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7641273.

The product of its (nonzero) digits is 900, while the sum is 28.

Adding to 66155011111 its reverse (11111055166), we get a palindrome (77266066277).

The spelling of 66155011111 in words is "sixty-six billion, one hundred fifty-five million, eleven thousand, one hundred eleven".