618910877221 has 24 divisors (see below), whose sum is σ = 780916990560. Its totient is φ = 486164724192.

The previous prime is 618910877197. The next prime is 618910877237. The reversal of 618910877221 is 122778019816.

It is not a de Polignac number, because 618910877221 - 2¹³ = 618910869029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618910871221) 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 23 ways as a sum of consecutive naturals, for example, 3406431 + ... + 3583516.

It is an arithmetic number, because the mean of its divisors is an integer number (32538207940).

Almost surely, 2^618910877221 is an apocalyptic number.

It is an amenable number.

618910877221 is a deficient number, since it is larger than the sum of its proper divisors (162006113339).

618910877221 is a wasteful number, since it uses less digits than its factorization.

618910877221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6990113 (or 6990106 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 52.

The spelling of 618910877221 in words is "six hundred eighteen billion, nine hundred ten million, eight hundred seventy-seven thousand, two hundred twenty-one".