66830539 has 4 divisors (see below), whose sum is σ = 67963320. Its totient is φ = 65697760.

The previous prime is 66830527. The next prime is 66830549. The reversal of 66830539 is 93503866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93503866 = 2 ⋅46751933.

It is a cyclic number.

It is not a de Polignac number, because 66830539 - 2¹⁵ = 66797771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66830549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566302 + ... + 566419.

It is an arithmetic number, because the mean of its divisors is an integer number (16990830).

Almost surely, 2^66830539 is an apocalyptic number.

66830539 is a deficient number, since it is larger than the sum of its proper divisors (1132781).

66830539 is a wasteful number, since it uses less digits than its factorization.

66830539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132780.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 66830539 is about 8174.9947400595. The cubic root of 66830539 is about 405.8120960664.

The spelling of 66830539 in words is "sixty-six million, eight hundred thirty thousand, five hundred thirty-nine".