655465993 has 18 divisors (see below), whose sum is σ = 825655374. Its totient is φ = 518603904.

The previous prime is 655465981. The next prime is 655466003. The reversal of 655465993 is 399564556.

It can be written as a sum of positive squares in 3 ways, for example, as 14768649 + 640697344 = 3843^2 + 25312^2 .

It is not a de Polignac number, because 655465993 - 2⁵ = 655465961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655465993.

It is not an unprimeable number, because it can be changed into a prime (655465913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 31296 + ... + 47857.

It is an arithmetic number, because the mean of its divisors is an integer number (45869743).

Almost surely, 2^655465993 is an apocalyptic number.

It is an amenable number.

655465993 is a deficient number, since it is larger than the sum of its proper divisors (170189381).

655465993 is a wasteful number, since it uses less digits than its factorization.

655465993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79193 (or 79173 counting only the distinct ones).

The product of its digits is 4374000, while the sum is 52.

The square root of 655465993 is about 25602.0700920844. The cubic root of 655465993 is about 868.6604624662.

The spelling of 655465993 in words is "six hundred fifty-five million, four hundred sixty-five thousand, nine hundred ninety-three".