864501671619541 has 2 divisors, whose sum is σ = 864501671619542. Its totient is φ = 864501671619540.

The previous prime is 864501671619539. The next prime is 864501671619613. The reversal of 864501671619541 is 145916176105468.

864501671619541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 794754470132100 + 69747201487441 = 28191390^2 + 8351479^2 .

It is a cyclic number.

It is not a de Polignac number, because 864501671619541 - 2¹ = 864501671619539 is a prime.

Together with 864501671619539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864501671619511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432250835809770 + 432250835809771.

It is an arithmetic number, because the mean of its divisors is an integer number (432250835809771).

Almost surely, 2^{864501671619541} is an apocalyptic number.

It is an amenable number.

864501671619541 is a deficient number, since it is larger than the sum of its proper divisors (1).

864501671619541 is an equidigital number, since it uses as much as digits as its factorization.

864501671619541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43545600, while the sum is 64.

The spelling of 864501671619541 in words is "eight hundred sixty-four trillion, five hundred one billion, six hundred seventy-one million, six hundred nineteen thousand, five hundred forty-one".