218038985551 has 2 divisors, whose sum is σ = 218038985552. Its totient is φ = 218038985550.

The previous prime is 218038985513. The next prime is 218038985579. The reversal of 218038985551 is 155589830812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218038985551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218038985492 and 218038985501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218038985581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109019492775 + 109019492776.

It is an arithmetic number, because the mean of its divisors is an integer number (109019492776).

Almost surely, 2^218038985551 is an apocalyptic number.

218038985551 is a deficient number, since it is larger than the sum of its proper divisors (1).

218038985551 is an equidigital number, since it uses as much as digits as its factorization.

218038985551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456000, while the sum is 55.

The spelling of 218038985551 in words is "two hundred eighteen billion, thirty-eight million, nine hundred eighty-five thousand, five hundred fifty-one".