218939378147 has 16 divisors (see below), whose sum is σ = 251797728000. Its totient is φ = 186476776992.

The previous prime is 218939378117. The next prime is 218939378233. The reversal of 218939378147 is 741873939812.

It is a cyclic number.

It is not a de Polignac number, because 218939378147 - 2¹⁴ = 218939361763 is a prime.

It is a super-2 number, since 2×218939378147² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 218939378147.

It is not an unprimeable number, because it can be changed into a prime (218939378117) 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 15 ways as a sum of consecutive naturals, for example, 7668104 + ... + 7696602.

It is an arithmetic number, because the mean of its divisors is an integer number (15737358000).

Almost surely, 2^218939378147 is an apocalyptic number.

218939378147 is a deficient number, since it is larger than the sum of its proper divisors (32858349853).

218939378147 is a wasteful number, since it uses less digits than its factorization.

218939378147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35402.

The product of its digits is 18289152, while the sum is 62.

The spelling of 218939378147 in words is "two hundred eighteen billion, nine hundred thirty-nine million, three hundred seventy-eight thousand, one hundred forty-seven".