918212890561 has 2 divisors, whose sum is σ = 918212890562. Its totient is φ = 918212890560.

The previous prime is 918212890477. The next prime is 918212890571. The reversal of 918212890561 is 165098212819.

It is a happy number.

918212890561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 723573098161 + 194639792400 = 850631^2 + 441180^2 .

It is a cyclic number.

It is not a de Polignac number, because 918212890561 - 2¹⁷ = 918212759489 is a prime.

It is a super-2 number, since 2×918212890561² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 918212890499 and 918212890508.

It is not a weakly prime, because it can be changed into another prime (918212890571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459106445280 + 459106445281.

It is an arithmetic number, because the mean of its divisors is an integer number (459106445281).

Almost surely, 2^918212890561 is an apocalyptic number.

It is an amenable number.

918212890561 is a deficient number, since it is larger than the sum of its proper divisors (1).

918212890561 is an equidigital number, since it uses as much as digits as its factorization.

918212890561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 52.

The spelling of 918212890561 in words is "nine hundred eighteen billion, two hundred twelve million, eight hundred ninety thousand, five hundred sixty-one".