699198561 has 10 divisors (see below), whose sum is σ = 1044481922. Its totient is φ = 466132320.

The previous prime is 699198553. The next prime is 699198581. The reversal of 699198561 is 165891996.

699198561 is a `hidden beast` number, since 69 + 9 + 19 + 8 + 561 = 666.

699198561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 406788561 + 292410000 = 20169^2 + 17100^2 .

It is not a de Polignac number, because 699198561 - 2³ = 699198553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 699198498 and 699198507.

It is not an unprimeable number, because it can be changed into a prime (699198541) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4315960 + ... + 4316121.

Almost surely, 2^699198561 is an apocalyptic number.

It is an amenable number.

699198561 is a deficient number, since it is larger than the sum of its proper divisors (345283361).

699198561 is an equidigital number, since it uses as much as digits as its factorization.

699198561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8632093 (or 8632084 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 699198561 is about 26442.3629995506. The cubic root of 699198561 is about 887.5650147703.

The spelling of 699198561 in words is "six hundred ninety-nine million, one hundred ninety-eight thousand, five hundred sixty-one".