8216634481591 has 2 divisors, whose sum is σ = 8216634481592. Its totient is φ = 8216634481590.

The previous prime is 8216634481577. The next prime is 8216634481637. The reversal of 8216634481591 is 1951844366128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8216634481591 - 2⁷ = 8216634481463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8216634482591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4108317240795 + 4108317240796.

It is an arithmetic number, because the mean of its divisors is an integer number (4108317240796).

Almost surely, 2^{8216634481591} is an apocalyptic number.

8216634481591 is a deficient number, since it is larger than the sum of its proper divisors (1).

8216634481591 is an equidigital number, since it uses as much as digits as its factorization.

8216634481591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9953280, while the sum is 58.

The spelling of 8216634481591 in words is "eight trillion, two hundred sixteen billion, six hundred thirty-four million, four hundred eighty-one thousand, five hundred ninety-one".