4218686639 has 2 divisors, whose sum is σ = 4218686640. Its totient is φ = 4218686638.

The previous prime is 4218686627. The next prime is 4218686671. The reversal of 4218686639 is 9366868124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4218686639 - 2⁸ = 4218686383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4218686039) 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 as a sum of consecutive naturals, namely, 2109343319 + 2109343320.

It is an arithmetic number, because the mean of its divisors is an integer number (2109343320).

Almost surely, 2^4218686639 is an apocalyptic number.

4218686639 is a deficient number, since it is larger than the sum of its proper divisors (1).

4218686639 is an equidigital number, since it uses as much as digits as its factorization.

4218686639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 53.

The square root of 4218686639 is about 64951.4175287961. The cubic root of 4218686639 is about 1615.8179281716.

The spelling of 4218686639 in words is "four billion, two hundred eighteen million, six hundred eighty-six thousand, six hundred thirty-nine".