1641399414209 has 4 divisors (see below), whose sum is σ = 1641434265540. Its totient is φ = 1641364562880.

The previous prime is 1641399414203. The next prime is 1641399414217. The reversal of 1641399414209 is 9024149931461.

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 695114050225 + 946285363984 = 833735^2 + 972772^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641399414209 - 2¹² = 1641399410113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641399414203) 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, 17354924 + ... + 17449245.

It is an arithmetic number, because the mean of its divisors is an integer number (410358566385).

Almost surely, 2^{1641399414209} is an apocalyptic number.

It is an amenable number.

1641399414209 is a deficient number, since it is larger than the sum of its proper divisors (34851331).

1641399414209 is an equidigital number, since it uses as much as digits as its factorization.

1641399414209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34851330.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 1641399414209 in words is "one trillion, six hundred forty-one billion, three hundred ninety-nine million, four hundred fourteen thousand, two hundred nine".