218700717677 has 4 divisors (see below), whose sum is σ = 235523849820. Its totient is φ = 201877585536.

The previous prime is 218700717671. The next prime is 218700717679. The reversal of 218700717677 is 776717007812.

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

It can be written as a sum of positive squares in 2 ways, for example, as 122420212996 + 96280504681 = 349886^2 + 310291^2 .

It is a cyclic number.

It is not a de Polignac number, because 218700717677 - 2¹⁴ = 218700701293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218700717671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8411566052 + ... + 8411566077.

It is an arithmetic number, because the mean of its divisors is an integer number (58880962455).

Almost surely, 2^218700717677 is an apocalyptic number.

It is an amenable number.

218700717677 is a deficient number, since it is larger than the sum of its proper divisors (16823132143).

218700717677 is a wasteful number, since it uses less digits than its factorization.

218700717677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16823132142.

The product of its (nonzero) digits is 1613472, while the sum is 53.

The spelling of 218700717677 in words is "two hundred eighteen billion, seven hundred million, seven hundred seventeen thousand, six hundred seventy-seven".