8406621103891 has 2 divisors, whose sum is σ = 8406621103892. Its totient is φ = 8406621103890.

The previous prime is 8406621103873. The next prime is 8406621103927. The reversal of 8406621103891 is 1983011266048.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8406621103891 - 2¹³ = 8406621095699 is a prime.

It is not a weakly prime, because it can be changed into another prime (8406621103841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4203310551945 + 4203310551946.

It is an arithmetic number, because the mean of its divisors is an integer number (4203310551946).

Almost surely, 2^{8406621103891} is an apocalyptic number.

8406621103891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8406621103891 is an equidigital number, since it uses as much as digits as its factorization.

8406621103891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 8406621103891 in words is "eight trillion, four hundred six billion, six hundred twenty-one million, one hundred three thousand, eight hundred ninety-one".