18927211140997 has 2 divisors, whose sum is σ = 18927211140998. Its totient is φ = 18927211140996.

The previous prime is 18927211140977. The next prime is 18927211141019. The reversal of 18927211140997 is 79904111272981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18872429866081 + 54781274916 = 4344241^2 + 234054^2 .

It is a cyclic number.

It is not a de Polignac number, because 18927211140997 - 2²³ = 18927202752389 is a prime.

It is a super-2 number, since 2×18927211140997² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18927211140907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9463605570498 + 9463605570499.

It is an arithmetic number, because the mean of its divisors is an integer number (9463605570499).

Almost surely, 2^{18927211140997} is an apocalyptic number.

It is an amenable number.

18927211140997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18927211140997 is an equidigital number, since it uses as much as digits as its factorization.

18927211140997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4572288, while the sum is 61.

The spelling of 18927211140997 in words is "eighteen trillion, nine hundred twenty-seven billion, two hundred eleven million, one hundred forty thousand, nine hundred ninety-seven".