213917886868623 has 64 divisors (see below), whose sum is σ = 352111941430272. Its totient is φ = 112731520112640.

The previous prime is 213917886868613. The next prime is 213917886868669. The reversal of 213917886868623 is 326868688719312.

It is a Cunningham number, because it is equal to 14625932²-1.

It is not a de Polignac number, because 213917886868623 - 2⁶ = 213917886868559 is a prime.

It is a super-2 number, since 2×213917886868623² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213917886868613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7312968 + ... + 21938898.

It is an arithmetic number, because the mean of its divisors is an integer number (5501749084848).

Almost surely, 2^{213917886868623} is an apocalyptic number.

213917886868623 is a deficient number, since it is larger than the sum of its proper divisors (138194054561649).

213917886868623 is a wasteful number, since it uses less digits than its factorization.

213917886868623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14626784.

The product of its digits is 2006581248, while the sum is 78.

The spelling of 213917886868623 in words is "two hundred thirteen trillion, nine hundred seventeen billion, eight hundred eighty-six million, eight hundred sixty-eight thousand, six hundred twenty-three".