655605993 has 32 divisors (see below), whose sum is σ = 1026432000. Its totient is φ = 364424256.

The previous prime is 655605971. The next prime is 655606009. The reversal of 655605993 is 399506556.

It is not a de Polignac number, because 655605993 - 2¹⁴ = 655589609 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (655605913) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241558 + ... + 244256.

It is an arithmetic number, because the mean of its divisors is an integer number (32076000).

Almost surely, 2^655605993 is an apocalyptic number.

It is an amenable number.

655605993 is a deficient number, since it is larger than the sum of its proper divisors (370826007).

655605993 is a wasteful number, since it uses less digits than its factorization.

655605993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021.

The product of its (nonzero) digits is 1093500, while the sum is 48.

The square root of 655605993 is about 25604.8041000122. The cubic root of 655605993 is about 868.7223033594.

The spelling of 655605993 in words is "six hundred fifty-five million, six hundred five thousand, nine hundred ninety-three".