618446664 has 96 divisors (see below), whose sum is σ = 1894969440. Its totient is φ = 187401600.

The previous prime is 618446659. The next prime is 618446687. The reversal of 618446664 is 466644816.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6924 + ... + 35844.

It is an arithmetic number, because the mean of its divisors is an integer number (19739265).

Almost surely, 2^618446664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 618446664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (947484720).

618446664 is an abundant number, since it is smaller than the sum of its proper divisors (1276522776).

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

618446664 is a wasteful number, since it uses less digits than its factorization.

618446664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28953 (or 28937 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 618446664 is about 24868.5878971847. The cubic root of 618446664 is about 851.9891885159.

The spelling of 618446664 in words is "six hundred eighteen million, four hundred forty-six thousand, six hundred sixty-four".