66910839 has 16 divisors (see below), whose sum is σ = 91422720. Its totient is φ = 43515360.

The previous prime is 66910819. The next prime is 66910873. The reversal of 66910839 is 93801966.

It is not a de Polignac number, because 66910839 - 2⁵ = 66910807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66910839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66910819) 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, 21802 + ... + 24680.

It is an arithmetic number, because the mean of its divisors is an integer number (5713920).

Almost surely, 2^66910839 is an apocalyptic number.

66910839 is a deficient number, since it is larger than the sum of its proper divisors (24511881).

66910839 is a wasteful number, since it uses less digits than its factorization.

66910839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3070.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 66910839 is about 8179.9045837956. The cubic root of 66910839 is about 405.9745650466.

The spelling of 66910839 in words is "sixty-six million, nine hundred ten thousand, eight hundred thirty-nine".