66111154213 has 8 divisors (see below), whose sum is σ = 71199328088. Its totient is φ = 61023366144.

The previous prime is 66111154211. The next prime is 66111154223. The reversal of 66111154213 is 31245111166.

It can be written as a sum of positive squares in 4 ways, for example, as 1627154244 + 64483999969 = 40338^2 + 253937^2 .

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

It is not a de Polignac number, because 66111154213 - 2¹ = 66111154211 is a prime.

It is a super-2 number, since 2×66111154213² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66111154211) 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, 328981 + ... + 490357.

It is an arithmetic number, because the mean of its divisors is an integer number (8899916011).

Almost surely, 2^66111154213 is an apocalyptic number.

It is an amenable number.

66111154213 is a deficient number, since it is larger than the sum of its proper divisors (5088173875).

66111154213 is a wasteful number, since it uses less digits than its factorization.

66111154213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192903.

The product of its digits is 4320, while the sum is 31.

Adding to 66111154213 its reverse (31245111166), we get a palindrome (97356265379).

The spelling of 66111154213 in words is "sixty-six billion, one hundred eleven million, one hundred fifty-four thousand, two hundred thirteen".