698819618869 has 2 divisors, whose sum is σ = 698819618870. Its totient is φ = 698819618868.

The previous prime is 698819618807. The next prime is 698819618891. The reversal of 698819618869 is 968816918896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478213740900 + 220605877969 = 691530^2 + 469687^2 .

It is a cyclic number.

It is not a de Polignac number, because 698819618869 - 2²³ = 698811230261 is a prime.

It is a super-2 number, since 2×698819618869² (a number of 24 digits) contains 22 as substring.

698819618869 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (698819918869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349409809434 + 349409809435.

It is an arithmetic number, because the mean of its divisors is an integer number (349409809435).

Almost surely, 2^698819618869 is an apocalyptic number.

It is an amenable number.

698819618869 is a deficient number, since it is larger than the sum of its proper divisors (1).

698819618869 is an equidigital number, since it uses as much as digits as its factorization.

698819618869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 644972544, while the sum is 79.

The spelling of 698819618869 in words is "six hundred ninety-eight billion, eight hundred nineteen million, six hundred eighteen thousand, eight hundred sixty-nine".