66836879 has 4 divisors (see below), whose sum is σ = 66856800. Its totient is φ = 66816960.

The previous prime is 66836863. The next prime is 66836881. The reversal of 66836879 is 97863866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66836879 - 2⁴ = 66836863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66836879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66836839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3554 + ... + 12095.

It is an arithmetic number, because the mean of its divisors is an integer number (16714200).

Almost surely, 2^66836879 is an apocalyptic number.

66836879 is a deficient number, since it is larger than the sum of its proper divisors (19921).

66836879 is a wasteful number, since it uses less digits than its factorization.

66836879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19920.

The product of its digits is 2612736, while the sum is 53.

The square root of 66836879 is about 8175.3824986969. The cubic root of 66836879 is about 405.8249283602.

The spelling of 66836879 in words is "sixty-six million, eight hundred thirty-six thousand, eight hundred seventy-nine".