618255888821 has 4 divisors (see below), whose sum is σ = 618806429472. Its totient is φ = 617705348172.

The previous prime is 618255888793. The next prime is 618255888839. The reversal of 618255888821 is 128888552816.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 618255888821 - 2¹⁰ = 618255887797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618255888851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275268641 + ... + 275270886.

It is an arithmetic number, because the mean of its divisors is an integer number (154701607368).

Almost surely, 2^618255888821 is an apocalyptic number.

It is an amenable number.

618255888821 is a deficient number, since it is larger than the sum of its proper divisors (550540651).

618255888821 is a wasteful number, since it uses less digits than its factorization.

618255888821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550540650.

The product of its digits is 19660800, while the sum is 62.

The spelling of 618255888821 in words is "six hundred eighteen billion, two hundred fifty-five million, eight hundred eighty-eight thousand, eight hundred twenty-one".