655999994 has 8 divisors (see below), whose sum is σ = 1059692340. Its totient is φ = 302769216.

The previous prime is 655999979. The next prime is 655999999. The reversal of 655999994 is 499999556.

It can be written as a sum of positive squares in 2 ways, for example, as 581436769 + 74563225 = 24113^2 + 8635^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 655999994.

It is not an unprimeable number, because it can be changed into a prime (655999999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12615359 + ... + 12615410.

Almost surely, 2^655999994 is an apocalyptic number.

655999994 is a deficient number, since it is larger than the sum of its proper divisors (403692346).

655999994 is a wasteful number, since it uses less digits than its factorization.

655999994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25230784.

The product of its digits is 35429400, while the sum is 65.

The square root of 655999994 is about 25612.4968326011. The cubic root of 655999994 is about 868.8962945046.

The spelling of 655999994 in words is "six hundred fifty-five million, nine hundred ninety-nine thousand, nine hundred ninety-four".