66552372 has 18 divisors (see below), whose sum is σ = 168229698. Its totient is φ = 22184112.

The previous prime is 66552371. The next prime is 66552377. The reversal of 66552372 is 27325566.

It is a happy number.

66552372 is a `hidden beast` number, since 6 + 65 + 523 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 47941776 + 18610596 = 6924^2 + 4314^2 .

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: 1848677 = 66552372 / (6 + 6 + 5 + 5 + 2 + 3 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66552371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 924303 + ... + 924374.

Almost surely, 2^66552372 is an apocalyptic number.

It is an amenable number.

66552372 is an abundant number, since it is smaller than the sum of its proper divisors (101677326).

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

66552372 is a wasteful number, since it uses less digits than its factorization.

66552372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848687 (or 1848682 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 66552372 is about 8157.9637165165. The cubic root of 66552372 is about 405.2482794063.

The spelling of 66552372 in words is "sixty-six million, five hundred fifty-two thousand, three hundred seventy-two".