66440602 has 4 divisors (see below), whose sum is σ = 99660906. Its totient is φ = 33220300.

The previous prime is 66440597. The next prime is 66440609. The reversal of 66440602 is 20604466.

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., 59892121 + 6548481 = 7739^2 + 2559^2 .

It is not an unprimeable number, because it can be changed into a prime (66440609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16610149 + ... + 16610152.

Almost surely, 2^66440602 is an apocalyptic number.

66440602 is a deficient number, since it is larger than the sum of its proper divisors (33220304).

66440602 is a wasteful number, since it uses less digits than its factorization.

66440602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33220303.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66440602 is about 8151.1104764934. The cubic root of 66440602 is about 405.0212903506.

The spelling of 66440602 in words is "sixty-six million, four hundred forty thousand, six hundred two".