618352993 has 8 divisors (see below), whose sum is σ = 640840680. Its totient is φ = 595943040.

The previous prime is 618352979. The next prime is 618353017. The reversal of 618352993 is 399253816.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 128527569 + 489825424 = 11337^2 + 22132^2 .

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

It is not a de Polignac number, because 618352993 - 2²⁵ = 584798561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618352793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2988 + ... + 35293.

It is an arithmetic number, because the mean of its divisors is an integer number (80105085).

Almost surely, 2^618352993 is an apocalyptic number.

It is an amenable number.

618352993 is a deficient number, since it is larger than the sum of its proper divisors (22487687).

618352993 is a wasteful number, since it uses less digits than its factorization.

618352993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38867.

The product of its digits is 349920, while the sum is 46.

The square root of 618352993 is about 24866.7045062268. The cubic root of 618352993 is about 851.9461717593.

The spelling of 618352993 in words is "six hundred eighteen million, three hundred fifty-two thousand, nine hundred ninety-three".