66155652 has 18 divisors (see below), whose sum is σ = 167226878. Its totient is φ = 22051872.

The previous prime is 66155651. The next prime is 66155657. The reversal of 66155652 is 25655166.

It is a happy number.

66155652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 63107136 + 3048516 = 7944^2 + 1746^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1837657 = 66155652 / (6 + 6 + 1 + 5 + 5 + 6 + 5 + 2).

It is not an unprimeable number, because it can be changed into a prime (66155651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 918793 + ... + 918864.

Almost surely, 2^66155652 is an apocalyptic number.

It is an amenable number.

66155652 is an abundant number, since it is smaller than the sum of its proper divisors (101071226).

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

66155652 is a wasteful number, since it uses less digits than its factorization.

66155652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837667 (or 1837662 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 66155652 is about 8133.6124815484. The cubic root of 66155652 is about 404.4414430961.

The spelling of 66155652 in words is "sixty-six million, one hundred fifty-five thousand, six hundred fifty-two".