1641565072 has 80 divisors (see below), whose sum is σ = 3829120000. Its totient is φ = 680762880.

The previous prime is 1641565069. The next prime is 1641565091. The reversal of 1641565072 is 2705651461.

It is a happy number.

It is a super-2 number, since 2×1641565072² = 5389471771220730368, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165304 + ... + 174952.

It is an arithmetic number, because the mean of its divisors is an integer number (47864000).

Almost surely, 2^1641565072 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 1641565072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1914560000).

1641565072 is an abundant number, since it is smaller than the sum of its proper divisors (2187554928).

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

1641565072 is an equidigital number, since it uses as much as digits as its factorization.

1641565072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9709 (or 9689 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 1641565072 is about 40516.2322038958. The cubic root of 1641565072 is about 1179.6487204867.

The spelling of 1641565072 in words is "one billion, six hundred forty-one million, five hundred sixty-five thousand, seventy-two".