17949780227 has 2 divisors, whose sum is σ = 17949780228. Its totient is φ = 17949780226.

The previous prime is 17949780179. The next prime is 17949780283. The reversal of 17949780227 is 72208794971.

It is an a-pointer prime, because the next prime (17949780283) can be obtained adding 17949780227 to its sum of digits (56).

It is a weak prime.

It is an emirp because it is prime and its reverse (72208794971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17949780227 - 2²⁶ = 17882671363 is a prime.

It is a super-2 number, since 2×17949780227² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (17949780287) 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, 8974890113 + 8974890114.

It is an arithmetic number, because the mean of its divisors is an integer number (8974890114).

Almost surely, 2^17949780227 is an apocalyptic number.

17949780227 is a deficient number, since it is larger than the sum of its proper divisors (1).

17949780227 is an equidigital number, since it uses as much as digits as its factorization.

17949780227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3556224, while the sum is 56.

The spelling of 17949780227 in words is "seventeen billion, nine hundred forty-nine million, seven hundred eighty thousand, two hundred twenty-seven".