1641605616 has 200 divisors, whose sum is σ = 5523872640. Its totient is φ = 460930176.

The previous prime is 1641605591. The next prime is 1641605627. The reversal of 1641605616 is 6165061461.

It is a happy number.

1641605616 is a `hidden beast` number, since 1 + 6 + 41 + 605 + 6 + 1 + 6 = 666.

1641605616 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 533715 + ... + 536781.

Almost surely, 2^1641605616 is an apocalyptic number.

1641605616 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 1641605616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2761936320).

1641605616 is an abundant number, since it is smaller than the sum of its proper divisors (3882267024).

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

1641605616 is a wasteful number, since it uses less digits than its factorization.

1641605616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3153 (or 3138 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1641605616 is about 40516.7325434813. The cubic root of 1641605616 is about 1179.6584322113.

The spelling of 1641605616 in words is "one billion, six hundred forty-one million, six hundred five thousand, six hundred sixteen".