1641048065 has 4 divisors (see below), whose sum is σ = 1969257684. Its totient is φ = 1312838448.

The previous prime is 1641048049. The next prime is 1641048077. The reversal of 1641048065 is 5608401461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 647600704 + 993447361 = 25448^2 + 31519^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641048065 - 2⁴ = 1641048049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164104802 + ... + 164104811.

It is an arithmetic number, because the mean of its divisors is an integer number (492314421).

Almost surely, 2^1641048065 is an apocalyptic number.

It is an amenable number.

1641048065 is a deficient number, since it is larger than the sum of its proper divisors (328209619).

1641048065 is an equidigital number, since it uses as much as digits as its factorization.

1641048065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328209618.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 1641048065 is about 40509.8514561582. The cubic root of 1641048065 is about 1179.5248649671.

The spelling of 1641048065 in words is "one billion, six hundred forty-one million, forty-eight thousand, sixty-five".