66578039 has 8 divisors (see below), whose sum is σ = 72824832. Its totient is φ = 60363640.

The previous prime is 66578021. The next prime is 66578041. The reversal of 66578039 is 93087566.

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

It is a cyclic number.

It is not a de Polignac number, because 66578039 - 2¹² = 66573943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66578009) 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, 3689 + ... + 12114.

It is an arithmetic number, because the mean of its divisors is an integer number (9103104).

Almost surely, 2^66578039 is an apocalyptic number.

66578039 is a deficient number, since it is larger than the sum of its proper divisors (6246793).

66578039 is a wasteful number, since it uses less digits than its factorization.

66578039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16197.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 66578039 is about 8159.5366902784. The cubic root of 66578039 is about 405.3003695642.

The spelling of 66578039 in words is "sixty-six million, five hundred seventy-eight thousand, thirty-nine".