218150999555 has 4 divisors (see below), whose sum is σ = 261781199472. Its totient is φ = 174520799640.

The previous prime is 218150999551. The next prime is 218150999581. The reversal of 218150999555 is 555999051812.

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

It is not a de Polignac number, because 218150999555 - 2² = 218150999551 is a prime.

It is a super-2 number, since 2×218150999555² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218150999494 and 218150999503.

It is not an unprimeable number, because it can be changed into a prime (218150999551) 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, 21815099951 + ... + 21815099960.

It is an arithmetic number, because the mean of its divisors is an integer number (65445299868).

Almost surely, 2^218150999555 is an apocalyptic number.

218150999555 is a deficient number, since it is larger than the sum of its proper divisors (43630199917).

218150999555 is an equidigital number, since it uses as much as digits as its factorization.

218150999555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43630199916.

The product of its (nonzero) digits is 7290000, while the sum is 59.

The spelling of 218150999555 in words is "two hundred eighteen billion, one hundred fifty million, nine hundred ninety-nine thousand, five hundred fifty-five".