918722697989 has 2 divisors, whose sum is σ = 918722697990. Its totient is φ = 918722697988.

The previous prime is 918722697941. The next prime is 918722698021. The reversal of 918722697989 is 989796227819.

918722697989 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., 876114720100 + 42607977889 = 936010^2 + 206417^2 .

It is a cyclic number.

It is not a de Polignac number, because 918722697989 - 2¹⁶ = 918722632453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (918722697689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459361348994 + 459361348995.

It is an arithmetic number, because the mean of its divisors is an integer number (459361348995).

Almost surely, 2^918722697989 is an apocalyptic number.

It is an amenable number.

918722697989 is a deficient number, since it is larger than the sum of its proper divisors (1).

918722697989 is an equidigital number, since it uses as much as digits as its factorization.

918722697989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493807104, while the sum is 77.

The spelling of 918722697989 in words is "nine hundred eighteen billion, seven hundred twenty-two million, six hundred ninety-seven thousand, nine hundred eighty-nine".