1601601618 has 64 divisors (see below), whose sum is σ = 3504384000. Its totient is φ = 486045504.

The previous prime is 1601601613. The next prime is 1601601623. The reversal of 1601601618 is 8161061061.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1601601613) and next prime (1601601623).

It is not an unprimeable number, because it can be changed into a prime (1601601611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 789121 + ... + 791147.

It is an arithmetic number, because the mean of its divisors is an integer number (54756000).

Almost surely, 2^1601601618 is an apocalyptic number.

1601601618 is an abundant number, since it is smaller than the sum of its proper divisors (1902782382).

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

1601601618 is a wasteful number, since it uses less digits than its factorization.

1601601618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1601601618 is about 40020.0152173884. The cubic root of 1601601618 is about 1169.9972284250.

Adding to 1601601618 its reverse (8161061061), we get a palindrome (9762662679).

The spelling of 1601601618 in words is "one billion, six hundred one million, six hundred one thousand, six hundred eighteen".