1618205568 has 128 divisors (see below), whose sum is σ = 5082048000. Its totient is φ = 446380032.

The previous prime is 1618205551. The next prime is 1618205569. The reversal of 1618205568 is 8655028161.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618205569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67573 + ... + 88331.

It is an arithmetic number, because the mean of its divisors is an integer number (39703500).

Almost surely, 2^1618205568 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 1618205568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2541024000).

1618205568 is an abundant number, since it is smaller than the sum of its proper divisors (3463842432).

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

1618205568 is a wasteful number, since it uses less digits than its factorization.

1618205568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20812 (or 20800 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 42.

The square root of 1618205568 is about 40226.9259079040. The cubic root of 1618205568 is about 1174.0264924026.

The spelling of 1618205568 in words is "one billion, six hundred eighteen million, two hundred five thousand, five hundred sixty-eight".