2040644400191 has 2 divisors, whose sum is σ = 2040644400192. Its totient is φ = 2040644400190.

The previous prime is 2040644400173. The next prime is 2040644400211. The reversal of 2040644400191 is 1910044460402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2040644400191 - 2²⁶ = 2040577291327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2040644400491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1020322200095 + 1020322200096.

It is an arithmetic number, because the mean of its divisors is an integer number (1020322200096).

Almost surely, 2^{2040644400191} is an apocalyptic number.

2040644400191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2040644400191 is an equidigital number, since it uses as much as digits as its factorization.

2040644400191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 35.

Adding to 2040644400191 its reverse (1910044460402), we get a palindrome (3950688860593).

The spelling of 2040644400191 in words is "two trillion, forty billion, six hundred forty-four million, four hundred thousand, one hundred ninety-one".