66111552 has 196 divisors, whose sum is σ = 213768940. Its totient is φ = 20155392.

The previous prime is 66111527. The next prime is 66111559. The reversal of 66111552 is 25511166.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26873856 + 39237696 = 5184^2 + 6264^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (66111559) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 606474 + ... + 606582.

Almost surely, 2^66111552 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 66111552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106884470).

66111552 is an abundant number, since it is smaller than the sum of its proper divisors (147657388).

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

66111552 is a wasteful number, since it uses less digits than its factorization.

66111552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 127 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 66111552 is about 8130.9010570785. The cubic root of 66111552 is about 404.3515549220.

The spelling of 66111552 in words is "sixty-six million, one hundred eleven thousand, five hundred fifty-two".