66072242 has 4 divisors (see below), whose sum is σ = 99108366. Its totient is φ = 33036120.

The previous prime is 66072221. The next prime is 66072247. The reversal of 66072242 is 24227066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 41460721 + 24611521 = 6439^2 + 4961^2 .

It is not an unprimeable number, because it can be changed into a prime (66072247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16518059 + ... + 16518062.

Almost surely, 2^66072242 is an apocalyptic number.

66072242 is a deficient number, since it is larger than the sum of its proper divisors (33036124).

66072242 is a wasteful number, since it uses less digits than its factorization.

66072242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33036123.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 66072242 is about 8128.4833763747. The cubic root of 66072242 is about 404.2713964091.

The spelling of 66072242 in words is "sixty-six million, seventy-two thousand, two hundred forty-two".