1641555163 has 4 divisors (see below), whose sum is σ = 1641891280. Its totient is φ = 1641219048.

The previous prime is 1641555101. The next prime is 1641555197. The reversal of 1641555163 is 3615551461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1641555163 - 2¹⁷ = 1641424091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641555463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160623 + ... + 170536.

It is an arithmetic number, because the mean of its divisors is an integer number (410472820).

Almost surely, 2^1641555163 is an apocalyptic number.

1641555163 is a deficient number, since it is larger than the sum of its proper divisors (336117).

1641555163 is an equidigital number, since it uses as much as digits as its factorization.

1641555163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336116.

The product of its digits is 54000, while the sum is 37.

The square root of 1641555163 is about 40516.1099193889. The cubic root of 1641555163 is about 1179.6463469057.

The spelling of 1641555163 in words is "one billion, six hundred forty-one million, five hundred fifty-five thousand, one hundred sixty-three".