618218899 has 4 divisors (see below), whose sum is σ = 621357264. Its totient is φ = 615080536.

The previous prime is 618218873. The next prime is 618218947. The reversal of 618218899 is 998812816.

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

It is a cyclic number.

It is not a de Polignac number, because 618218899 - 2⁹ = 618218387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618218099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1568887 + ... + 1569280.

It is an arithmetic number, because the mean of its divisors is an integer number (155339316).

Almost surely, 2^618218899 is an apocalyptic number.

618218899 is a deficient number, since it is larger than the sum of its proper divisors (3138365).

618218899 is a wasteful number, since it uses less digits than its factorization.

618218899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138364.

The product of its digits is 497664, while the sum is 52.

The square root of 618218899 is about 24864.0081040849. The cubic root of 618218899 is about 851.8845838905.

The spelling of 618218899 in words is "six hundred eighteen million, two hundred eighteen thousand, eight hundred ninety-nine".