6618858385 has 4 divisors (see below), whose sum is σ = 7942630068. Its totient is φ = 5295086704.

The previous prime is 6618858361. The next prime is 6618858397. The reversal of 6618858385 is 5838588166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2016728464 + 4602129921 = 44908^2 + 67839^2 .

It is a cyclic number.

It is not a de Polignac number, because 6618858385 - 2¹⁹ = 6618334097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661885834 + ... + 661885843.

It is an arithmetic number, because the mean of its divisors is an integer number (1985657517).

Almost surely, 2^6618858385 is an apocalyptic number.

It is an amenable number.

6618858385 is a deficient number, since it is larger than the sum of its proper divisors (1323771683).

6618858385 is a wasteful number, since it uses less digits than its factorization.

6618858385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323771682.

The product of its digits is 11059200, while the sum is 58.

The square root of 6618858385 is about 81356.3665916811. The cubic root of 6618858385 is about 1877.5623288487.

The spelling of 6618858385 in words is "six billion, six hundred eighteen million, eight hundred fifty-eight thousand, three hundred eighty-five".