1641165243 has 8 divisors (see below), whose sum is σ = 2188852800. Its totient is φ = 1093793928.

The previous prime is 1641165241. The next prime is 1641165263. The reversal of 1641165243 is 3425611461.

1641165243 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1641165243 - 2¹ = 1641165241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1641165241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66673 + ... + 87906.

It is an arithmetic number, because the mean of its divisors is an integer number (273606600).

Almost surely, 2^1641165243 is an apocalyptic number.

1641165243 is a deficient number, since it is larger than the sum of its proper divisors (547687557).

1641165243 is a wasteful number, since it uses less digits than its factorization.

1641165243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158121.

The product of its digits is 17280, while the sum is 33.

The square root of 1641165243 is about 40511.2977205125. The cubic root of 1641165243 is about 1179.5529387081.

The spelling of 1641165243 in words is "one billion, six hundred forty-one million, one hundred sixty-five thousand, two hundred forty-three".