618138228921 has 8 divisors (see below), whose sum is σ = 824396247840. Its totient is φ = 411986181312.

The previous prime is 618138228863. The next prime is 618138228931. The reversal of 618138228921 is 129822831816.

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

It is not a de Polignac number, because 618138228921 - 2⁷ = 618138228793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (618138228931) 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, 26479215 + ... + 26502548.

It is an arithmetic number, because the mean of its divisors is an integer number (103049530980).

Almost surely, 2^618138228921 is an apocalyptic number.

It is an amenable number.

618138228921 is a deficient number, since it is larger than the sum of its proper divisors (206258018919).

618138228921 is a wasteful number, since it uses less digits than its factorization.

618138228921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52985655.

The product of its digits is 663552, while the sum is 51.

The spelling of 618138228921 in words is "six hundred eighteen billion, one hundred thirty-eight million, two hundred twenty-eight thousand, nine hundred twenty-one".