1641609216 has 432 divisors, whose sum is σ = 5611394880. Its totient is φ = 460062720.

The previous prime is 1641609197. The next prime is 1641609223. The reversal of 1641609216 is 6129061461.

1641609216 is a `hidden beast` number, since 1 + 6 + 41 + 609 + 2 + 1 + 6 = 666.

It is a super-2 number, since 2×1641609216² = 5389761636112269312, which contains 22 as substring.

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 35 ways as a sum of consecutive naturals, for example, 52955121 + ... + 52955151.

It is an arithmetic number, because the mean of its divisors is an integer number (12989340).

Almost surely, 2^1641609216 is an apocalyptic number.

1641609216 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 1641609216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2805697440).

1641609216 is an abundant number, since it is smaller than the sum of its proper divisors (3969785664).

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

1641609216 is a wasteful number, since it uses less digits than its factorization.

1641609216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1641609216 is about 40516.7769695468. The cubic root of 1641609216 is about 1179.6592945312.

The spelling of 1641609216 in words is "one billion, six hundred forty-one million, six hundred nine thousand, two hundred sixteen".