1018698958889 has 2 divisors, whose sum is σ = 1018698958890. Its totient is φ = 1018698958888.

The previous prime is 1018698958877. The next prime is 1018698958951. The reversal of 1018698958889 is 9888598968101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 748584883264 + 270114075625 = 865208^2 + 519725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1018698958889 is a prime.

It is a super-2 number, since 2×1018698958889² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1018698958859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509349479444 + 509349479445.

It is an arithmetic number, because the mean of its divisors is an integer number (509349479445).

Almost surely, 2^{1018698958889} is an apocalyptic number.

It is an amenable number.

1018698958889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1018698958889 is an equidigital number, since it uses as much as digits as its factorization.

1018698958889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 716636160, while the sum is 80.

The spelling of 1018698958889 in words is "one trillion, eighteen billion, six hundred ninety-eight million, nine hundred fifty-eight thousand, eight hundred eighty-nine".