1641165903609 has 16 divisors (see below), whose sum is σ = 2191092332352. Its totient is φ = 1092675400128.

The previous prime is 1641165903521. The next prime is 1641165903613. The reversal of 1641165903609 is 9063095611461.

It is not a de Polignac number, because 1641165903609 - 2¹⁶ = 1641165838073 is a prime.

It is a super-3 number, since 3×1641165903609³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1641165903679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20054994 + ... + 20136660.

It is an arithmetic number, because the mean of its divisors is an integer number (136943270772).

Almost surely, 2^{1641165903609} is an apocalyptic number.

It is an amenable number.

1641165903609 is a deficient number, since it is larger than the sum of its proper divisors (549926428743).

1641165903609 is an equidigital number, since it uses as much as digits as its factorization.

1641165903609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90376.

The product of its (nonzero) digits is 1049760, while the sum is 51.

The spelling of 1641165903609 in words is "one trillion, six hundred forty-one billion, one hundred sixty-five million, nine hundred three thousand, six hundred nine".