218150999581 has 2 divisors, whose sum is σ = 218150999582. Its totient is φ = 218150999580.

The previous prime is 218150999551. The next prime is 218150999609. The reversal of 218150999581 is 185999051812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217146680100 + 1004319481 = 465990^2 + 31691^2 .

It is a cyclic number.

It is not a de Polignac number, because 218150999581 - 2¹³ = 218150991389 is a prime.

It is a super-2 number, since 2×218150999581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218150999551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109075499790 + 109075499791.

It is an arithmetic number, because the mean of its divisors is an integer number (109075499791).

Almost surely, 2^218150999581 is an apocalyptic number.

It is an amenable number.

218150999581 is a deficient number, since it is larger than the sum of its proper divisors (1).

218150999581 is an equidigital number, since it uses as much as digits as its factorization.

218150999581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 58.

The spelling of 218150999581 in words is "two hundred eighteen billion, one hundred fifty million, nine hundred ninety-nine thousand, five hundred eighty-one".