218591789051 has 2 divisors, whose sum is σ = 218591789052. Its totient is φ = 218591789050.

The previous prime is 218591789029. The next prime is 218591789077. The reversal of 218591789051 is 150987195812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218591789051 is a prime.

It is not a weakly prime, because it can be changed into another prime (218591789951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109295894525 + 109295894526.

It is an arithmetic number, because the mean of its divisors is an integer number (109295894526).

Almost surely, 2^218591789051 is an apocalyptic number.

218591789051 is a deficient number, since it is larger than the sum of its proper divisors (1).

218591789051 is an equidigital number, since it uses as much as digits as its factorization.

218591789051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 56.

The spelling of 218591789051 in words is "two hundred eighteen billion, five hundred ninety-one million, seven hundred eighty-nine thousand, fifty-one".