618668613 has 12 divisors (see below), whose sum is σ = 894104640. Its totient is φ = 412227816.

The previous prime is 618668599. The next prime is 618668623. The reversal of 618668613 is 316866816.

It is not a de Polignac number, because 618668613 - 2⁴ = 618668597 is a prime.

It is a super-2 number, since 2×618668613² = 765501705422687538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618668623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 868 + ... + 35186.

It is an arithmetic number, because the mean of its divisors is an integer number (74508720).

Almost surely, 2^618668613 is an apocalyptic number.

It is an amenable number.

618668613 is a deficient number, since it is larger than the sum of its proper divisors (275436027).

618668613 is a wasteful number, since it uses less digits than its factorization.

618668613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36328 (or 36325 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 618668613 is about 24873.0499336129. The cubic root of 618668613 is about 852.0910973479.

The spelling of 618668613 in words is "six hundred eighteen million, six hundred sixty-eight thousand, six hundred thirteen".