66909039 has 16 divisors (see below), whose sum is σ = 90652800. Its totient is φ = 43890336.

The previous prime is 66909023. The next prime is 66909091. The reversal of 66909039 is 93090966.

It is not a de Polignac number, because 66909039 - 2⁴ = 66909023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66909239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94017 + ... + 94725.

It is an arithmetic number, because the mean of its divisors is an integer number (5665800).

Almost surely, 2^66909039 is an apocalyptic number.

66909039 is a deficient number, since it is larger than the sum of its proper divisors (23743761).

66909039 is a wasteful number, since it uses less digits than its factorization.

66909039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174.

The product of its (nonzero) digits is 78732, while the sum is 42.

The square root of 66909039 is about 8179.7945573223. The cubic root of 66909039 is about 405.9709245762.

The spelling of 66909039 in words is "sixty-six million, nine hundred nine thousand, thirty-nine".