618888913 has 8 divisors (see below), whose sum is σ = 646571880. Its totient is φ = 591628800.

The previous prime is 618888911. The next prime is 618888947. The reversal of 618888913 is 319888816.

It can be written as a sum of positive squares in 4 ways, for example, as 336245569 + 282643344 = 18337^2 + 16812^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 618888913 - 2¹ = 618888911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618888911) 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 7 ways as a sum of consecutive naturals, for example, 102720 + ... + 108577.

It is an arithmetic number, because the mean of its divisors is an integer number (80821485).

Almost surely, 2^618888913 is an apocalyptic number.

It is an amenable number.

618888913 is a deficient number, since it is larger than the sum of its proper divisors (27682967).

618888913 is a wasteful number, since it uses less digits than its factorization.

618888913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211427.

The product of its digits is 663552, while the sum is 52.

The square root of 618888913 is about 24877.4780273242. The cubic root of 618888913 is about 852.1922249350.

The spelling of 618888913 in words is "six hundred eighteen million, eight hundred eighty-eight thousand, nine hundred thirteen".