66354009 has 16 divisors (see below), whose sum is σ = 94284288. Its totient is φ = 41363712.

The previous prime is 66353983. The next prime is 66354019. The reversal of 66354009 is 90045366.

It is a happy number.

It is not a de Polignac number, because 66354009 - 2²⁵ = 32799577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66354019) 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 in 15 ways as a sum of consecutive naturals, for example, 3864 + ... + 12150.

It is an arithmetic number, because the mean of its divisors is an integer number (5892768).

Almost surely, 2^66354009 is an apocalyptic number.

It is an amenable number.

66354009 is a deficient number, since it is larger than the sum of its proper divisors (27930279).

66354009 is a wasteful number, since it uses less digits than its factorization.

66354009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8464.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 66354009 is about 8145.7970144118. The cubic root of 66354009 is about 404.8452571460.

The spelling of 66354009 in words is "sixty-six million, three hundred fifty-four thousand, nine".