66111400 has 24 divisors (see below), whose sum is σ = 153709470. Its totient is φ = 26444480.

The previous prime is 66111391. The next prime is 66111413. The reversal of 66111400 is 411166.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 59629284 + 6482116 = 7722^2 + 2546^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 165079 + ... + 165478.

Almost surely, 2^66111400 is an apocalyptic number.

It is an amenable number.

66111400 is an abundant number, since it is smaller than the sum of its proper divisors (87598070).

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

66111400 is a wasteful number, since it uses less digits than its factorization.

66111400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330573 (or 330564 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 66111400 is about 8130.8917100156. The cubic root of 66111400 is about 404.3512450342.

Adding to 66111400 its reverse (411166), we get a palindrome (66522566).

The spelling of 66111400 in words is "sixty-six million, one hundred eleven thousand, four hundred".