1618601616 has 140 divisors (see below), whose sum is σ = 4738198720. Its totient is φ = 535377600.

The previous prime is 1618601597. The next prime is 1618601629. The reversal of 1618601616 is 6161068161.

It is a super-2 number, since 2×1618601616² = 5239742382635622912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1760805 + ... + 1761723.

Almost surely, 2^1618601616 is an apocalyptic number.

1618601616 is a gapful number since it is divisible by the number (16) 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 1618601616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2369099360).

1618601616 is an abundant number, since it is smaller than the sum of its proper divisors (3119597104).

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

1618601616 is an equidigital number, since it uses as much as digits as its factorization.

1618601616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096 (or 1075 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1618601616 is about 40231.8482796901. The cubic root of 1618601616 is about 1174.1222636951.

Adding to 1618601616 its reverse (6161068161), we get a palindrome (7779669777).

The spelling of 1618601616 in words is "one billion, six hundred eighteen million, six hundred one thousand, six hundred sixteen".