66111012 has 72 divisors (see below), whose sum is σ = 188434400. Its totient is φ = 20029680.

The previous prime is 66110987. The next prime is 66111043. The reversal of 66111012 is 21011166.

66111012 is a `hidden beast` number, since 661 + 1 + 1 + 0 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10539 + ... + 15597.

Almost surely, 2^66111012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66111012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94217200).

66111012 is an abundant number, since it is smaller than the sum of its proper divisors (122323388).

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

66111012 is a wasteful number, since it uses less digits than its factorization.

66111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5094 (or 5075 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 66111012 is about 8130.8678503589. The cubic root of 66111012 is about 404.3504540027.

Adding to 66111012 its reverse (21011166), we get a palindrome (87122178).

The spelling of 66111012 in words is "sixty-six million, one hundred eleven thousand, twelve".