66204442 has 16 divisors (see below), whose sum is σ = 105175872. Its totient is φ = 31188960.

The previous prime is 66204427. The next prime is 66204461. The reversal of 66204442 is 24440266.

It is a self number, because there is not a number n which added to its sum of digits gives 66204442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7659 + ... + 13822.

It is an arithmetic number, because the mean of its divisors is an integer number (6573492).

Almost surely, 2^66204442 is an apocalyptic number.

66204442 is a deficient number, since it is larger than the sum of its proper divisors (38971430).

66204442 is a wasteful number, since it uses less digits than its factorization.

66204442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21573.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 66204442 is about 8136.6112110632. The cubic root of 66204442 is about 404.5408442731.

The spelling of 66204442 in words is "sixty-six million, two hundred four thousand, four hundred forty-two".