66602409 has 8 divisors (see below), whose sum is σ = 90969312. Its totient is φ = 43318560.

The previous prime is 66602401. The next prime is 66602441. The reversal of 66602409 is 90420666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66602409 - 2³ = 66602401 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 66602409.

It is not an unprimeable number, because it can be changed into a prime (66602401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270619 + ... + 270864.

It is an arithmetic number, because the mean of its divisors is an integer number (11371164).

Almost surely, 2^66602409 is an apocalyptic number.

It is an amenable number.

66602409 is a deficient number, since it is larger than the sum of its proper divisors (24366903).

66602409 is a wasteful number, since it uses less digits than its factorization.

66602409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541527.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 66602409 is about 8161.0298982420. The cubic root of 66602409 is about 405.3498151235.

The spelling of 66602409 in words is "sixty-six million, six hundred two thousand, four hundred nine".