66207572 has 6 divisors (see below), whose sum is σ = 115863258. Its totient is φ = 33103784.

The previous prime is 66207539. The next prime is 66207601. The reversal of 66207572 is 27570266.

It is a happy number.

66207572 is digitally balanced in base 9, 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., 42432196 + 23775376 = 6514^2 + 4876^2 .

66207572 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8275943 + ... + 8275950.

It is an arithmetic number, because the mean of its divisors is an integer number (19310543).

Almost surely, 2^66207572 is an apocalyptic number.

It is an amenable number.

66207572 is a deficient number, since it is larger than the sum of its proper divisors (49655686).

66207572 is a wasteful number, since it uses less digits than its factorization.

66207572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16551897 (or 16551895 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 66207572 is about 8136.8035493061. The cubic root of 66207572 is about 404.5472194389.

The spelling of 66207572 in words is "sixty-six million, two hundred seven thousand, five hundred seventy-two".