699999561 has 24 divisors (see below), whose sum is σ = 1047411456. Its totient is φ = 450018720.

The previous prime is 699999557. The next prime is 699999571. The reversal of 699999561 is 165999996.

699999561 is a `hidden beast` number, since 69 + 9 + 9 + 9 + 9 + 561 = 666.

It is not a de Polignac number, because 699999561 - 2² = 699999557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (699999571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77466 + ... + 86028.

It is an arithmetic number, because the mean of its divisors is an integer number (43642144).

Almost surely, 2^699999561 is an apocalyptic number.

It is an amenable number.

699999561 is a deficient number, since it is larger than the sum of its proper divisors (347411895).

699999561 is a wasteful number, since it uses less digits than its factorization.

699999561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8893 (or 8890 counting only the distinct ones).

The product of its digits is 10628820, while the sum is 63.

The square root of 699999561 is about 26457.5048143244. The cubic root of 699999561 is about 887.9038161283.

The spelling of 699999561 in words is "six hundred ninety-nine million, nine hundred ninety-nine thousand, five hundred sixty-one".