1641720510211 has 4 divisors (see below), whose sum is σ = 1643749831800. Its totient is φ = 1639691188624.

The previous prime is 1641720510197. The next prime is 1641720510253. The reversal of 1641720510211 is 1120150271461.

It is a happy number.

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 1641720510211 - 2²⁷ = 1641586292483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641720510011) 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, 1014659581 + ... + 1014661198.

It is an arithmetic number, because the mean of its divisors is an integer number (410937457950).

Almost surely, 2^{1641720510211} is an apocalyptic number.

1641720510211 is a deficient number, since it is larger than the sum of its proper divisors (2029321589).

1641720510211 is an equidigital number, since it uses as much as digits as its factorization.

1641720510211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029321588.

The product of its (nonzero) digits is 3360, while the sum is 31.

Adding to 1641720510211 its reverse (1120150271461), we get a palindrome (2761870781672).

The spelling of 1641720510211 in words is "one trillion, six hundred forty-one billion, seven hundred twenty million, five hundred ten thousand, two hundred eleven".