618441664 has 56 divisors (see below), whose sum is σ = 1293327360. Its totient is φ = 292833024.

The previous prime is 618441647. The next prime is 618441667. The reversal of 618441664 is 466144816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618441667) 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, 149577 + ... + 153655.

Almost surely, 2^618441664 is an apocalyptic number.

618441664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 618441664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (646663680).

618441664 is an abundant number, since it is smaller than the sum of its proper divisors (674885696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

618441664 is a wasteful number, since it uses less digits than its factorization.

618441664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4217 (or 4207 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 618441664 is about 24868.4873685554. The cubic root of 618441664 is about 851.9868924637.

The spelling of 618441664 in words is "six hundred eighteen million, four hundred forty-one thousand, six hundred sixty-four".